If she abuses you in anyway, get out of that situation immediately.
Abuse is a two way street and it's a horrible thing to experience.
Here is a hotline just in case.
Always use magic as a last resort.
Cut off contact with her completely. Don't respond to any of her texts or calls.
Your weight is fine as it is as long as you don't have life threatening obesity. Don't let her or anyone else get under your skin.
And this specific thing, whatever it may be, it would be best to let it go. Don't let it bother you. What has happened has happened and there's nothing you can do about it. Live and let live.
Bright blessings to you.