Spice up the relationship

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Is there a link where you describe said relationship? Also if I understand things correctly the relationship ended, you are now back together and things "are not they way they were"? Guess what dude they aren't going to be again, chances are it's doomed and nothing you can do is going to change that. But if there is a problem I seriously doubt looking for ways to spice up the sex life is going to fix anything. Infact there is a good chance it will just push her further away.

I don't know what specifically you need to do but in general you need to find activities you can do together that result in laughing, happiness and feelings of enjoyment and you need to find ways to intimate with her that do not involve sex. You basically work on a relationship.

Also dude, she's just turned 21 and wants to start going to bars, for most girls this isn't a time in their life where they are looking for serious relationships - especially one that has already failed once. just a courtesy FYI.