Probably pregnant... Her eggspot is pronounced and live bearers can store sperm for months so if you bought her within the last few months, most likely she is pregnant. If you want to keep the fry, put her in another tank (maybe your qt?) and let her give birth there. Or you can leave her in the tank and when she gives birth the fittest fry may survive if they can hide. The other fish and the mother will cull the rest.
Good luck, - Raymond