Welcome to YT Marsha!
I'll start off by saying that at 9 weeks your baby should still be with her mommy & littermates. Going to the bathroom several times a day is normal. As long as it's neither very hard or very loose she should be fine. Did the vet do a fecal test? Should have...If you notice stools that are very loose, take her in to have one done to rule out parasites.
I've never dealt with a yeast infection in the ears, so I can't help you there. Are her ears standing up yet? I know sometimes if they are not standing, it can cause infection so you have to be sure to keep them clean & dry.
Also, you may want to check out the stickies on this forum...very useful information & may help you out with any issues you may run into... especially b/c your baby is too young to be away from her mom. Many find that their baby didn't learn bite inhibition if they left mom too early. Just trying to help you prepare yourself.
Good luck!