What your both saying in one breath, is you want to change your friend/sister to be what you think they should be like.

In another breath, it's about the friendship you have when she's single and not when she's attached.

Some women love being, in love, being held, being in a relationship and there is nothing you can do to change them, that's their make-up, their being, their sole.

As for wanting some "girl time" absolutely. Just tell her how much you love her and miss her and perhaps you can do a dinner once a month, or coffee, movies, catch up on your own.

The other thing with women whom like being in relationships is they don't like going out to pubs/clubs with a girlfriend for fear that their fellow may think that they are cheating or would. So, i wouldn't be suggesting that.

Obviously you miss her, so tell her, " i miss you" let's have a commitment of catching up once a fortnight, type of thing. See what happens.

Good luck, friends you can count on your fingers, so always good to try to keep them.