She's a cute little fish. She is a fat one, could be preg but I don't see a real dark spot. But then again platties can fool you there. Nice picture with her facing you, It helps to see how fat she is.
Does this behavior seem like she is pregnant -- shes not eating
Looks as though she emptied herslef from poop
she cant go in tank coz guppies are chasing her everywhwere and still trying to get her through breeeding trap.
By looking at her she Is PREGNET but looks like she just begin to get fat, I think u should take her out of the breeding box, It dont look like shes fat enough,
I dont see a gravid spot, also I have 2 females bigger than her and they are not preggo. They just like to eat. and my male doesnt give them the time of the day. He chases the guppies.