I wouldn't worry. And I wouldn't pay too much heed to when they are 'supposed' to do certain things, it's easy to get hung up about little things like rolling, sitting up, crawling etc etc, but no baby completes ALL these milestones at EXACTLY the age they are 'supposed' to. More often they concentrate on one particular thing - my friend's little girl was fabulous at many physical skills eg crawling, walking, climbing etc but way behind her peers in speech.
I think that over use of dummies is supposed to be a barrier to speech development, for obvious reasons, so if she has a dummy then maybe limiting this will encourage more babbling, as will talking and singing to her lots yourself, but other than that she will do things in her own time!
When my DD1 was a baby, I read somewhere that if they didn't babble by 9 months it might be worth getting checked out. In the end, my DD first babbled just ^5 days^ before she was 9 months. She's never had any other speech issues (well, apart from social anxiety so she won't speak in public, but no speech development issues anyway) so it was just one of those individual things.
Mine didn't babble until 9 months- and being paranoid I got her hearing checked which was completely normal. She is happily baba and dada ing away now at 12 months but no sign of any words- I think they just all do things in their own time...
great that your baby is vocalising- consonants can come between 6-9+ months. This is when they are starting to experiment with mouth shapes e.g. putting lips together, blowing rasberries making labial [b][m] sounds.
Try not to worry- plenty of time. Copy her sounds, babies love that and gives her reinforcment and praise of the noises she is making.