Let me start by saying how sorry I am for you loss. I know how difficult it is. We lost one a few months ago and it still hurts.
When your older dog passed, the boss dog was gone. This made your romanian dog the top dog. Before the lower ranking dog followed the boss dog's lead. The boss dog made the decisions. Now the Romanian dog feels that it is her right now to make the decisions and she doesn't seem to feel that you are her boss and thus she isn't obeying you.
It actually isn't hard to fix but will take work. She'll need formal obedience training. This doesn't mean she has to have a formal class, but does need a specific time set aside for training every day and you will be practicing the same command over and over again until the dog listens the first time every time. Use hot dog slivers for treats while training. They are usually high enough in value that dogs will gladly work for them (obey). Each time a dog obeys a command, they become a little more submissive to the person giving the command. Once she views you as the boss, she should listen to your commands the first time every time.
The following site is helpful in helping owners train their dog. Be sure and click on the link to the page on obedience at the bottom. and links on subsequent pages leading to detailed instructions.
Training works best if you train at least 30 minutes a day (two 15 minute sessions). I would start making your dog work via the Nothing in life is free program (NILF). It is outlined below.
In addition, you need to work on the recall command (come). If you think she has desensitized herself to the word you use to call her to you, change it to something such as HERE. It sounds weird, but a dog that ignores come, might eagerly come to the command HERE once she realizes she get hot dog sliver.
Many dogs don't come when called because they have learned that the only time they are called is when fun time is over. People call their dogs to them to make them come inside or to stop chasing prey (cats) or to be put on leash (end of free running time) or even crated. The only association they have with the come command is negative. Additionally, dogs find chase to be a highly amusing game and have learned that if they get close to a human, the human might chase them. They love a good game. So what you need to do is make coming to you more pleasurable.
The easiest way is to reward your dog with small tiny treats and praise whenever your dog comes to you when you give the command. Do this even when the dog wants to come to you. After a few treats, the dog will associate coming to you with getting treats and praise. Outside, you will want to use a long lead. Do not drag your dog to you, but say the command and if the dog doesn't come, give the leash a short tug. Start with short distances and gradually extend the distance as your dog becomes more familiar with the command. Over time, you will reduce the treats and increase the praise until praise is the only reward. Another thing to remember is to never call a dog to you to discipline it, go to the dog. During training I don't call a dog to me unless it is going to be pleasant for the dog. I usually don't have much of a problem since the dogs quickly learn that I have thinly sliced hot dog treats just waiting for them to obey me.
I alway recommend starting inside since most dogs are more than willing to come when inside. You can even have a helper and both call the dog to them in turn rewarding the dog for coming to you.
Training should eliminate the problem pretty quickly. I think the fastest I've seen improvement was within a week and almost all clients see improvement within a few weeks.
I hope this information is helpful to you. 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 . If you do find this helpful, please take this opportunity to rate my answer positively so I am compensated for my time.