Hi
It sounds like your fiance is just finding it hard to adjust to being a parent and this is something you already have practice with and that might make it even harder for her.
Perhaps when she went out on Memorial Day Weekend, she just needed some timeout- to feel young again and not to feel like she was only needed for her milk. It is very common for women to go through this and they need you to be understanding.
Go and talk to her and find out how she is feeling and what she wants. I am sure she misses you and it just as miserable and is probably finding it really hard dealing with it all by herself.
I agree, it is not a good idea to go to a baby everytime they cry, but you need to work out a balance so that she is comfortable as a mother.
If she is struggling as a mother, she does not have the energy to give you any love and affection - you just need to be patient and keep making her feel loved and wanted and wait for her to come back to you.
I hope it works out for you.