Your mom doesn't know shit despite being gender non-conforming and meaning well. You're not gonna grow out of wanting a fem body. HRT is worthwhile even if you already went through puberty. Leave your home state ASAP. Fascism will have a resurgence, watch out for these folk. Never ever buy a HP product, you will regret it for the rest of your days.
"Those feelings of longing you get when you see pretty girls isn't loneliness or sexual attraction, it's dysphoria and gender envy you dumb bitch! You're trans!!!!!"
„So this one thought that manages to come up every now and then when you're not blasting your brain with five different types of media at once? That innocent curiosity about how life would be?
Yeah, like... Actually explore that thought and don't dismiss it, will ya?“
"You're different, stop trying to fit your experiences into the expected mold. Also, trans people exist (I didn't know at the time) hint hint. Oh, and here are tonight's lottery numbers."
I would tell her "Hey idiot, you're not a femboy, you're a trans girl, stop denying who you are and transition" and because I know she would say something stupid about how boys can dress cute too, I would let her know that cis boys don't have the urge to dress and look like girls.