My daughter can't pronounce the letter 'R'

when i was a kid my mum used to have the same problem as me. i would never say R and frustrating enough for her should would sit and try to spend hours trying to teach me and it would go like this... mum - RRRRRRRABBIT me - RRRR WABBIT but i grew out of it. maybe just keep letting her know that what she is saying is wrong and try spend time with her each day showing her how to pronounce R. if u dont see any results i would take her to speech therapy before she gets too much older