YTA for the following reasons:
You do not accept your daughters sexual orientation. Love is love regardless of gender.
Lesbianism is not a “lifestyle”
You “punished” your 19 year old daughter for having a relationship. She’s 19! I think grounding kids should stop at 17.
Yes, lesbians can have female friends
Like it or not your daughter is going to date women and you get to decide right now if you are going to love and accept her for who she is. Otherwise, you are going to continue a relationship with her based on judgment and distrust (that YOU caused because you have not created an environment where she feels she can be herself with you).