I'm glad to hear that Kramer is doing better. Maybe she just had a little upset tummy from something that she got into.
Have you given her anything new to eat these past few days, like treats. I remember one time when I had bought a new treat for the cats instead of their regular one and my RB Katie started to vomit a few times a day for 3 days. She was still drinking and eating but stayed to herself. I brought her to the vets and we both figured that it was the new treat that upset her tummy and the next day she was fine.

I pray that Kramer continues to stay well.