I don't know your situation but from the outside looking in it seems as though your friend may have just said that so as not to hurt your feelings. If she has been in a lesbian relationship before she probably isn't as scared as you are to initiate something. If you feel like you are in the right setting and the timing seems right then just try. If it is too fast for her then maybe you two should talk again. Sometimes it is better to just stay as friends and not cross that line, but that is a decision both of you have to make.