From what it looks like, it seems like your girlfriend doesn't feel particularly loved and understood. If this is happening there's something she likely expects from you, but it's hard to know what that might be isn't it?
There's a particular concept that really comes to mind from this and past experiences, known as The Five Love Languages. This describes the expectations of how two individuals expect to have affection/love communicated. It doesn't only apply to romance too, its uses extend beyond those types of relationships.
What it really tackles is figuring out what someone needs from you or what you need from someone else. The five languages are defined as the following:
- Receiving gifts
- Quality time
- Affirmative words
- Acts of service
- Physical contact
Often times conflict and lack of feelings of love arrive from simply not understanding how your partner observes it. You need to figure out how both of you expect to receive love communication. Once you do that, you'll be able to balance your relationship and understand your partner a lot better. You'll know how they expect to feel loved and better serve that need.
From the comment you left, she was upset you didn't kiss her when you got home. She could expect "Physical Contact" as a language and having a kiss when you get home is something that's important to her.
Have a discussion with her about these love languages and ask her what's important to her and what makes her feel loved. You will no longer have the need to actually tell her to stop guilting you because you won't feel guilty anymore (since you know what she wants you to do). By fixing the root problem, you will remove the undesired side-effects. :)