Milhouse did not get new skin
Did you get the dialogue of Millhouse saying he needed to rescue her? If not, make sure he is free to trigger that to start. If that didn't would I would reinstall the game next. If that doesn't work then I think you'll need to reach out to EA customer service. Luckily I have been reading good things about them lately so hopefully it wont be too painful for you to call them.
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