If she has 135+ signs, why would she talk?

Also, for perspective:

"By fifteen months of age most children are able to say “thank you” or something similar. Most will be able to indicate their wants by using words, by pointing, and by using gestures. Fifteen-to-eighteen-month olds' vocabularies will be growing daily. Most children this age have a vocabulary of four to six words, including names."

http://www.education.com/reference/article/Ref_CHILDREN_FIFTEEN/?page=2