My pet mouse died this morning?

I had three mice, one of them died. She was very small. Her eyes seemed a little watery. She was all black but her nose looked very red. Her tail was also stiff but I don't think it was a kinked tail, it just didn't move as fluidly as the others tails. She also made clicking noises and nasal sounds like she... show more I had three mice, one of them died. She was very small. Her eyes seemed a little watery. She was all black but her nose looked very red. Her tail was also stiff but I don't think it was a kinked tail, it just didn't move as fluidly as the others tails. She also made clicking noises and nasal sounds like she was sniffing or something. I just got her a few weeks ago and I'm new to owning mice but I don't want my other two to become sick. They seem fine other than one of them having soft stool and the other making sounds similar to sneezing. If anyone has any ideas please share. I'm a vet student if that helps.
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