I'm sure you are aware of pack hierarchy. There can be a male and female alpha but not two female alphas. As a pup you were the boss, now she is not as sure. She can disobey without much reprimands so to speak from you, but she can intimidate you with the nipping. This might have her thinking she is the boss. I couldn't say for sure without seeing the interaction myself though it does seem like this is a contributing factor. So to help stop that, you need to do more training with her on a daily basis. At least 15 minutes of training preferably before she acts up and without your partner there. This helps reestablish you as the boss and who she has to listen to. You can use treats as reward, but not all the time. It has to be alternated with praise as the reward.
I want you to work on a release command. She sits well and knows down but jumps up. If you haven't taught her a command saying it is ok to get up, she uses her own judgement. With a release command, you can make her sit or lay down for longer periods of time before giving the treat, thus stretching out your treats and the length of time she is good for. You just have to remember and tell everyone (partner) that they have to use the release command and not leave the dog in that position indefinitely or she will stop waiting for it and you will be back where you are now.
I also want you to start the speak and quiet commands. . It seems easier to teach the quiet command after the dog has learned the speak command. The following site explains teaching speak and quiet commands.
If this doesn't work, you may have to try a citronella bark collar or a shock collar. Try the training first. I really think that will be your best bet to stop the barking issue.
Also I would start making your dog work via the Nothing in life is free program (NILF). It is outlined below.
She may be trying to get you to play and doesn't realize it is not fun for you. Dogs often bark and jump in and nip or even mouth another dog to enlist them in play. Another dog responds with high tones of response which the dog interprets as them wanting to play, so you can not use the high pitched cry. That is really only for very small pups If she is mouthing you, shove your arm or hand in further. Not forcefully, just push it further in to make her uncomfortable. They seldom keep exhibiting a behavior that results in discomfort to them, so if she mouths your hand, put it in far enough that she might get that gag look. She will stop quick. Right now when your partner leaves, she thinks it is play time since the boss is gone and has figured out that if she comes and starts mouthing you, barking and nipping, you stop what you are doing and play with her. To a dog obedience training is play. You show her attention when she acts in that manner.
So instead, have special times already set up in which you train with her and then when you are not training, you can use those commands to cut down on her interruptions. But if you have her sit and wait for the release, remember to release her every 5 minutes or so and give the treats and then extend it over time so she continues to want to obey. Use good treats like hot dog slivers for this. You can use other treats for other times, but use these high value treats for the stay, down, release and quiet commands. You really want her to listen to those and that will get her attention.
You might also want to consider getting a basket muzzle for her as well. It will help you be less anxious and not have to worry about her nipping. If you are relaxed, she will be more relaxed.
You want to do all of this now as you will have a baby soon and she needs this basic obedience to you down because once the baby is here, you need to teach her to stay away from the baby completely or she may start reprimanding the baby for getting close to her toys or touching her or even want to play with the baby. So teaching them to stay totally away from them is the best thing. When you are ready to tackle that training, just contact me again and we will go over that training. I have rotties and they will all get up and move away from a baby or toddlers approaching them. It certainly helps avoid any conflict.
I hope this information is helpful to you and you are satisfied with my response. If you would like any additional information or have more questions please don’t hesitate to press the reply to expert or continue conversation button so I can address any issues you still have .