I tend to get cold around camp and sleeping compared to my husband. Some things that have worked well for me:
-I always bring a separate set of clothes to sleep in that I change into once we've stopped and are no longer sweating around camp. A silkweight or lightweight top and bottom work just fine. I find that if I leave on my sweaty baselayer and just layer over the top of it, I don't warm up. It feels so good to change into a fresh baselayer, sans sweaty bra, and then put on my heavier mid layers. When it's bedtime, I don't have to worry about changing clothes in the colder temps and can just slip under my quilt or into my bag.
-I'm always packing an R1 or Cap 4 fleece as my midlayer. I throw my windshirt on top of those until I feel like it's time for a heavier layer (a lightweight or midweight puffy depending on the temps). It's better to have it and not need it than need it and not have it! :-) I always pack my rain jacket which can be the final layer if need be to really seal in the warmth.
-Fresh socks for bed is a must. I actually find I sleep better in a pair of thin cotton/poly running socks rather than wool. If I need some extra warmth, I put some hand warmers down by my feet and that really helps when the temps really drop.
-As others have mentioned, have your GF keep hydrated and snack on something before bed. I like some trail mix and hot chocolate to warm me up inside. I make sure to take a potty break to empty the bladder. I find that if I wake up and have to pee that it takes me a while to warm back up again.
-In colder temps I need a hat for sleeping. I've actually found that I sleep well when I have a lightweight fitted running hoodie over my head and then wear my hat over the hood. I can toss and turn without getting chills on my neck.
I also require more warmth for sleeping, using a 30 degree quilt up to 50 degrees and my 15 degree bag to mid-30s. I can always stick out a leg if need be.