My girlfriend says "I feel like I jumped in too quickly"?

Giving her some space does show her that you care, it cannot be easy so really well done. I would send her an email or sms or something of the sort, every now again again just letting her know, that she was in my thoughts today, or something like if she needs to chat to remember you are there for her, try and keep it causal but not to causal, hope this helps. By the way sounds like you have an awesome mom, who has her head screwed on right, I think she hit the nail on the head.