the person i am talking about, is a professional, but not in that area, she helps me with tbi stuff
It sounds like she is helping you in one area, but not in another area that is also causing you distress. And she is not trained to help, regarding the things that you have disclosed to her, but she wants you to keep talking to her and make a safety plan, because she is concerned that you are in crisis. Conversely, you are concerned that the things you are disclosing to her, are harming her because she isn't trained in that area.
getting a bit better, at least being able to do the basics of life on my own and stay calm and happy.
It sounds like she is someone who cares about you and your health, and wants to do her best to contribute to your health in a positive way. Can she set you up with an additional resource, someone/team, that is trained for the additional things you have disclosed to her? Someone that can work with you on that part, while she works with you on the tbi, so that you can start to feel a bit better?
i am scared they'll lock me up
Is there an intervention in between being in crisis and being locked up? An outpatient program? day program? group? There usually are options other than being locked in a facility, unless you are a danger to yourself/others. Can she recommend something, or set you up with someone who can?
The feeling that the things you talk about are hurting or causing harm to the person hearing it, is really common. I can't count the number of times I've read something like that here on the forum. If it's a professional, it's not harming them. It's also the reason that therapists have therapists, so that they can help their clients without getting hurt themselves.