I would either keep trying or mix it. I’m also an “enough” pumper when I have to pump (been out of town a couple times) and mixing it has definitely helped him take some of the older, less fresh milk.

You could put it in her bath! I never had that problem with food but whenever I had to pump I would always forget about it in the fridge and would just have to use it for her bath. It helps with their skin and hair!