Speech delay 21 month old

RJ

Hi ladies. My daughter is 21 months now. She says about 6 words about the same she is been saying from 18 months but she is great at understanding and reacts accordingly to the situation and grasps so quickly and imitates does some signs. She is really getting what we are upto but can't say words yet. I know evey kid is different so we wanted to start speed therapy for her. So they say it is monthly twice sessions for about an hour. So this less time does she really picks up and will it really helps putting her in therapy. Pls respond and pour some suggestions and share your experiences 🙏 thanks in advance