Why would your friend take it upon themselves to send a text to her? I hope you address it with her and ask that she not interfere with your personal life.
She may just be taking time on her own and not responding to anyone because she needs a break from it all. Try and reach out again and if you can't get in touch and her mum is worried then calling the police for help may be needed...if you are worried for her health and safety.
Does she have a history of going off on her own and not responding to people? Are you worried because she told you to care for her horses if something happened to her and now you haven't heard from her? Try and reach back out to her mom.
Do you feel she has been distraught since she broke up with you? Trying to get a sense of what you feel is going on for her. I know she had issues with your business client and ended things on her choice. I imagine you have sent her a text or voicemail letting her know you care and are there for her if she needs you?
I am hoping by now that someone in her family or you have heard from her. Again, as I stated yesterday if you are worried for her safety then calling to police may be in order.
I am glad she is ok but her behavior suggests that she uses fear and manipulation to get what she wants. While she may not like one of your business clients that doesn't mean she can stamp her feet and decide with whom you work. She disappears and gets everyone frightened in the hope that you drop this client and then she will come back to you. I hope for her that she can get some help to deal with her feelings and choices she makes around her behavior. Again she is allowed to have any feeling she has, but her demands and reactions to things are what may be a bit inappropriate and certainly play on your fears and worries. Nothing wrong to take time on her own, but this was more like a disappearing act to scare you into behaving how she desires.
We can dissect each word but it comes down to the same stuff. she wants to be with you but only in the way she deems as best and connecting with others isn't like that...there is a give and take and an awareness of the others feelings, etc. Only you can decide if you want to respond to these messages and if you do, setting a boundary seems to be important. It seems that the relationship has run its course so keep that in mind as you move through this tough space.