Please need help!

I am a senior in high school who lives with his mother. About 8 years ago after my parents divorced my mom began to change in behavior in terms of her perception of reality - speaking to the radio and becoming religious. Its been hard growing up with my mother as she always stressed and hovering over my shoulder. She originally took her medication on her own but I soon had to ensure she continued without her noticing. So I like this girl in school and am going to prom with her.My mom for the most part has never really been a part of my highschool life but now i think as I am leaving for highschool she feals lonely and insecure. My mom has started calling up my friends and asking them questions about where/whom am I with. I know that my mom doesn't want me to be with a girl but I really want to go to prom. I basically want to know if it is a good idea to tell the girl i like about my moms condition and to be weary of her phone calls. But the thing is that i have never told anyone about my mom before and am worried ied about her response. Please help
Ps-This girl and i are good friends and we like each other. I really wants a girls opinion the situation. Thanks

I don't think it would hurt to tell her. I'm sure she would understand, especially if you told her you were doing it for the benefit of both you and your mom.

If it were me, I'd probably tell my mom too, in honesty. Based on what you posted, I know my relationship with mom isn't the same as yours, and I am limited based on my own experiences and the information your provided. But I would think she would find out anyway, and it's usually better to tell her upfront than be caught. Furthermore, if she's already insecure, I don't think it'd help her to do something (even something as innocent as prom) behind her back. She won't see it like you will, based on your post.

That is just as I see it, at any rate. I do hope I was of some help.