speech therapy?

A
Just had my daughters 18 month appointment yesterday and our pediatrician recommended speech therapy because she has not said 15 words yet, only 5-10 and she doesn't use them consistently. she lets us know everything she wants with her hands & sounds, but she understands everything we say, understands commands, knows what things are called, etc etc. I know this isn't a big deal just wondering if anyone has any similar experiences or has looked into speech therapy around this age?