What should I do if my girlfriend has let herself go (appearance) @ age 21?

Anonymous
I have been with her for 3 years now and over the past 1.5 yrs...I have noticed her not caring about her appearance.

She Doesn't really dress up...its mainly something like those stretchy black pants and a sweatshirt in colder months. In warmer months, she won't wear a skirt or dress.

Sometimes I come over, she's still in her work clothes and doesn't bother to change out of them.

She also has put on a noticeable amount of weight. (Shes been very inactive...if she isn't working, she's lounging around watching TV or eating.)

She also claims to wash her hair every other day because that's what girls do? but I find the greasy hair very unattractive.

I feel like she's stopped caring because we have been dating 3 years and her plan was for both of us to move in together this year and get married...also on a side not -- things have gotten routine, boring, the sex is down to 1-2 times a month(she doesn't seem interested) and she makes fun of my interests... I'm having 2nd thoughts about this relationship...

what would you do?
What should I do if my girlfriend has let herself go (appearance) @ age 21?
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