My son is 17 months old and sounds just like your daughter. He says "mama", "dada" and "bye-bye" on a regular basis and that's pretty much it. I'm not too concerned just yet, some babies talk earlier than others. I am keeping an eye on the situation. Our pediatrician said not to worry too much about it yet either, but I am still watching. Here is some information that I found that can serve as warning signs:
*at 12 months, doesn't use gestures such as waving or shaking her head
*by 12 months, isn't practicing using at least a couple of consonants (p, b, etc.)
*by 12 months, isn't somehow communicating to you when she needs help with something
*at 15 months, doesn't understand and respond to words such as "no" and "bye-bye"
*by 15 months, can't say at least one to three words
*by 15 months, doesn't say "mama" or "dada"
*at 16 months, doesn't point to body parts when asked
*at 18 months, isn't saying at least six to 10 words
This information is from the Early Childhood Intervention office in Collin County:
**I'm 12 months old! I...respond to my name
may be scared of strangers
look for an object if you hide it from me, even if I can't see it
crawl on my hands and knees
pull myself to a standing position
walk by holding onto furniture
can drink from a cup with your help
enjoy playing games, like peek-a-boo or patty cake
say 1 to 2 words
**I'm 15 months old! I...
use gestures
like to look at pictures in a book
can hold a crayon in a fist
hand toys to you when you ask me
can point to pictures you name, if the things in the picture are familiar to me
walk alone without help
**I'm 18 months old! I...
like to pull and push things
follow simple directions
pull off shoes and socks
feed myself sometimes
step off low objects and keep balance
turn 2 to 3 pages of a book at a time
can point to one body part
can name one object
like to copy your words or actions
I hope this information helps, I'm anxious to see other mom's responses.