Hi Karine,
Honestly, I followed what felt right for me and my 3 children in regards to sleep and nursing. I always nursed on demand for the most part, whether it was for nourishment or comfort. My first baby stopped nursing at about 13 months, my second at about 9 months, and my third at about 12 months. It is a special bonding time for both of you. We are social beings and our babies need to know that we will be there for them from day one. If you want them to come to you later when they are in need, it starts now. She's only 7 months old, the night waking will pass. Enjoy the special time you have with her now. I always night nursed. We also co-slept so it was really easy. I'd wake up in the morning and not really remember how many times they nursed during the night. If they stirred, they could basically nurse on their own and we'd both be back to sleep in minutes. Since she is teething, she needs extra comfort from you and the nursing will do that, too. Don't worry so much about what other people say, you know what is right for you and your baby. If it feels like the right thing to do, it probably is.
I got a lot of comments from friends, family, and the pediatrician about co-sleeping and night nursing. I worried about it a lot with my first baby, but later realized that I was so glad that I just followed my own instincts and did what felt right for our family. My children are 8, 5, and 3 yrs old now. We have very strong relationships, they are well adjusted, they sleep well, and they know that it is always ok to come to me for anything.
I hope that helped to ease your mind. :)
Kat
http://www.workathome-united.com