Need advice on my 1st mouse!

Hello all!

Need some mouse advice.

I just got a mouse from the pet store that I work at and she’s had multiple litters and I wanted her to have a good retirement. I named her Mama Gloria.

However, she is still large and I’m not sure if she’s pregnant because it’s been over a month that she’s been that size ( I’m still trying to find her a vet, so far everyone around me does not work with mice, which is so disappointing.)

I plan to get her a friend. I just wasn’t sure if it was safe to give her another female mouse if she is pregnant BUT if it is safe i will get her a friend immediately!

TLDR: Is it possible my mouse is overweight and not pregnant and also should I go ahead and get her a friend?