You'll probably notice an explosion of sounds in the next few weeks.
When you have decided she's started talking, you'll suddenly realise she's been making definite focussed sounds for some time, but you hadn't realised! For example, my son would say "jhou" (don't know how to spell it!) and eventually I realised it was referring to a drink - "juice".
Children can get very frustrated with being unable to express the ideas in their heads, so try & be patient with the process.
Have fun!