Sweetie, if it helps your family get some sleep, do it. I know that you will be doing it safely, and she is 8 weeks old! It isn't going to last forever, and it will calm her to know that you are near by.
Don't stress about this, and don't feel guilty for doing it. I did it sometimes, and my daughter is a very secure little girl who knows that her mommy cares for her instead of putting her in a cot for her to cry it out.
There are millions of women all over the world that do this, and their babies are fine.
If it is safe, and right for YOUR family, go ahead.
You can fix any problems later, but the odds are that she is going to be fine going to sleep in her cot pretty soon. That's what I found.
Don't stress about it, and don't worry about the future. The here and now is what is important to your daughter, so focus on that.
Congratulations on your baby!