Yikes, I remember when she took a break earlier in the FBI seasons for her pregnancy, those episodes w/o her were kinda rough to get through.
It's only a rumor right now. Here is the article on it.
FBI Recap: Is the Team About to Lose Maggie?
'FBI' Season 6 Episode 10 set the stage for Missy Peregrym's Maggie to be pulled from the field -- maybe for good?
tvline.com
Warning, it has spoilers on the recent episode. I even haven't seen it yet. But apparently something happens in it to allow Maggie to walk away in the show. Or at least for a period of time again.
I mean she has two 2 children, so I understand. But the show was just renewed for 3 more seasons. Would hate to see Missy walk away as she is probably my favorite character.