All those physical changes are kind of against Monica's character, maybe except the hair color. I mean she perceives herself perfect and so she doesn't need any "upgrades". She is "the most beautiful woman in the city" after all. More than that other characters seem to agree with her.
Bigger boobs, lips and so on are usually for those unsecure characters from those stories where a shy girl becomes a slut or a bimbo.
With regard to blonde hair... I think it is possible for some events, for example for the promised plot where Monica becomes an adult actress. Monica needs a lot of money to pay to that hag at the hotel, so she is persuaded to participate in a porno movie. In order not be recognized she changes her hair color for the shooting, maybe something else. It might be cool, actually.
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