Noticed this in Mika over the last couple days.  She seems to have itchy eyes occasionally, but they never seemed to be red.

Guessing a minor trauma/ infection? She isn't rubbing it (maybe a little) or messing with it much.

Could be the start of cherry eye. Check it the best you can for any foreign objects like grass seeds or hairs. If she has itchy eyes some she could suffer from dry eye which would help along cherry eye. Vet will give drops more than likely that could clear it up as long as not allowed to get out of control if it is in fact cherry eye.