Her mom has recently given birth to her new fawn(s). She probably gave her doe fawn from last year the boot for the time being... In a couple weeks they will reunite when the newly born fawn(s) are a bit bigger. I wouldn't worry about the doe. She probably wasn't mature enough to breed last year, so she has no fawn or her own this year. This fall she'll be ready to breed and will do her own thing.
