hi gloria, i cant believe how many people told you to stop nursing. no offense to any of them, but this can certainly be overcome, as i did with all 3 of mine, fairly easily, too. is she biting or kind of scraping you? she can learn to be careful even if it is just scraping....this is your baby's first lesson in "no".... if she bites/scrapes you, immediately tell her a stern NO and take her off the breast (you stick your pinky finger gently into the corner of her mouth to break the seal), then pull your shirt down and thats the end of it. i would put her down immediately if possible and break eye contact. i know this is not always possible, for me it was enough to take her off, close my shirt, and look away while holding her safely. it depends on the baby. my first 2 responded well to turning away, this one thinks i am hilarious when i tell him no, so i put him down and that worked.....she will fuss or cry, you have to let her for a minute. and i really do mean only a minute, it was all i needed. i did this a few times with each baby and it worked. breaking eye contact is the key, as i found it to be with many things, like when they try banging their head for the first time, etc. and if she has a bad latch, take her off and re-latch her. do it every time, its easy for bad habits to form. be sure her mouth is full of you, squish your breast like a sandwich and put it in as far as you can (within reason, of course :)
try to take note of when she bites you. often it is at the start to get a better latch or if you dont have a great grip on her and she feels a bit insecure or uncomfortable, or at the end of the nursing session when she is getting full or falling asleep, sometimes they startle as they fall asleep and bite. in that case, its up to you to stay alert and when you feel her finishing up, you take her off as described above and end it or switch sides.
i used nipple shields for a day or 3 when i had sore nipples right in the beginning with my current baby. it saved my nipples, but they were not good for my supply at all, the baby cant suck quite as hard. at 9 mos, this is probably not a problem for you, your supply is well established by now, but be aware of it. mine is 9 mos too, as as he eats more and more solids my supply is adjusting and dwindling rapidly, if you use nipple shields, just be aware of it and maybe add in a pumping session during the day to compensate, im about to do that.
also, let the air get to your nipples when you can. put some breastmilk on them and let them air dry, this will help them to heal. (lansinoh never worked for me, it irritated me a bit. im allergic to wool, thats probably why.) best of luck to you, i know how much it hurts, but it can be overcome. take care, D.