This is advice I give to anyone asking about potty training, because it's almost guranteed to work, but it takes time. You will need to dedicate your day to this, so if possible, try to find a babysitter for your 8 month old for a day. Start in the morning with your daughter loading her up with LOTS of liquids. Then start taking her every 15 to 30 minutes to the potty. (You may want to consider using regular cloth underwear this day so she can feel and you can see if she starts to go.) If she doesn't go, say "that's ok, we'll try again later", but give no other attention or affection. If she does, literally make it a party! Sing, dance, get some party hats and balloons, maybe even a cupcake. Call Daddy or Grandma or an aunt or uncle, someone she loves, and make a big deal about it with them (you may want to prepare them in advance!), and even call one of her favorite cartoon characters (Elmo, JoJo, Clifford, whoever... obviously a friend or family member who can pretend on the phone.) REALLY make this a HUGE deal so she will WANT to do it again. Now of course, you can't do this EVERY time she goes, but do it the first time, and then gradually subdue the "party" each time after that during the day. I bet that by the end of the day she will be going by herself. On following days, continue to really praise her and show her plenty of attention when she uses the potty so it will continue to be something she is proud of and associates with happy times.
One other helpful thing to try, maybe in combination with the "party", is the "potty training Elmo". You can get it at Toys-R-Us and I think Wal-mart. It comes with an Elmo doll with removeable underwear, a toy potty and a potty-training book for Elmo. When you press the hand or whatever to turn him on, he says he's got to go. If you get his underwear down and sit him on the potty in time, he cheers and plays music. If not, he says something like "Oh oh, maybe next time." Anyway, this might be a way to encourage your daughter to try.
Well, I hope this helps. Good luck!