and that's the "façade" angle I wanted them to explore with MJ, not the ugly duckling to beauty angle.
obviously, they'd have to tone down the "party girl" and "flirting" aspect of the character for HS ( though, SSM MJ was quite flirty - she jumped from one guy to the next.

).
but, they could still portray her as the fun loving, popular girl who never seems to take life seriously. the latter part, not taking life seriously, would be the façade. she masks her own troubled homelife by acting like she just lives for the moment without a care in the world.
maybe, that's a turn off to Peter at first. maybe that's why he's attracted to Liz at first. and maybe, as Peter's own problems as Peter AND Spidey start weighing on him, he starts getting annoyed with MJ's seemingly carefree attitude. and that causes friction between the two.
but then something happens that triggers a change. maybe as Spidey, Peter catches a glimpse of MJ's real homelife and sees it's not all rainbows and sunshine for her. Maybe he sees her running away from her home crying, and he follows her to her "safe spot." Wearing a mask as Spidey gives Peter the confidence to approach her and talk with her. Talking to Spidey strangely gives MJ the confidence to be honest about her feelings for once. So they have a nice talk and start to understand each other better.
later on, MJ learns Peter's secret and remembering her conversation she had with him as Spidey, realizes the great burden he's been carrying all this time. that gives her confidence to face her own problems without having to resort to her own "mask."
I'd much rather see that dynamic than any ugly duckling transformation.