Quoting FutureMommyof2:" Teach her some basic sign so she can communicate with you guys. Sounds like she is frustrated that she ... [snip!] ... had similar behavior until she learned to sign and then is improved drastically. She was a sign maniac haha good luck!"
Quoting FutureMommyof2:" Nope and they are often more receptive at this age as well. I didn't introduce sign until 10 months and by 13 she was on it! "