Hartz

I noticed a flea on my dog and used some Hartz Ultraguard flea and tick drops on her about two or three hours ago before realizing that it's caused serious problems and even death for other pets in the past. I freaked out and washed her with Dawn non-concentrated Simply Clean to try to get some of it off of her. I told my MIL that lives with us that it's caused problems and deaths in the past because she used it on her dog as well and she seems to think I'm being ridiculous and stupid for having washed it off. Will my dog be ok since I washed it off of her as much as I could? She's a year and a half and about 50lbs, MIL's dog is my dogs sister, same age and weight.