My husband and cousins are seriously allergic, they touch one tiny dot of it and it gets in their bloodstream and spreads EVERYWHERE. Occasionally, they have also been hospitalized. Gold Bond Medicated cream seems to help it go away faster for my husband (not sure about my cousins). Also, benadryll helps sometimes. And I have heard that breastmilk will help, but since I'm running on empty we haven't actually tried it. It might be something to consider putting on your daughter if she does actually get it since it wouldn't give her any side effects.
Do you know where you are being exposed to it? It is is on your property I would get rid of it with either sprays (they are poisonous! beware!) or pay someone else to come and rip it all out for you. Do you have outdoor pets? They may be getting it on themselves and then spreading it to you. Or, perhaps you got it while someone was mowing over a patch of it and small particles of it got carried over near you. If you are allergic, that may be enough to do it. The best way to prevent it in the future is to figure out where you are exposed to it and then stay away! Make sure you know what poison ivy, poison oak, and poison sumac (spelling?) all look like because if you are allergic to one, you very well may be allergic to the rest (I would think it very likely).
Good Luck! It is miserable I know, just try to keep any infected part of you or your husband from touching your DD until you are no longer oozing the oils. And if she gets it, keep a close eye on her and play it by ear as to whether or not you take her to ER/Doctor.
OH! Just remembered, if you KNOW you just touched it, wash with an oil cutting dish soap like DAWN, it is more effective at removing the oils than normal body soaps will be.
Hey, Babe + Me = Little Man 07-27-08 & the Storm Sprite 07-11-10