How can I help my 6 year old?

How can I help my 6 year old? My child has had a stammer on and off since they were 2. It came back in October and seems to have stuck. She often stamps her foot or taps her fingers to help her get her words out and sometimes gets frustrated. She has just started speech therapy but I was wondering if there is anything in particular I could do to help her as a parent? Also any good advice I can pass onto her teacher? Thanks