With small livebearers if I want a high fry rate I usually remove the female once she begins slowing down. Some girls take only a few minutes to release all their young, while others (especially the new moms) can take hours or in some cases even days.
Clean water and a day or two of pampering would be nice after that many babies, imo, lol, but you do also have those people who just plop the Mom back in with the male or community tank right after. It's mainly a matter of personal opinion. Livebearers are pregnant a good portion of their lives, so the females have evolved to be fairly used to it and able to recover quickly.