Sounds like you are doing all the right things, I don't think there is much else you could or should be doing. We are at the start of the speech pathology journey (Speech Dyspraxia) and I will say, it is a very involved thing that can require weekly visits and daily exercises... I'd probably see how she is at 2 before pushing too much further as it is very normal for the 'word explosion' to occur around then, at 17mo she definitely has time but really, do what makes you feel comfortable and if that is seeking some medical opinions, do it!

For us, DD didn't start trying to say words before 2 but was doing noises of things (animals, trucks, planes etc); she could (and can) understand complex concepts (her hearing tester [which will be what they look into first should there be a concern] had her partaking in things usually set aside for those of preschool age) so we knew it wasn't to do with a lack of comprehension and that sounds like your DD too which is a good sign, really. The thing that was of concern with us was the way in which she was trying to speak; saying the same word slightly differently every time or being unable to repeat a word she had said again, leaving off consonants at the start or end of a word such as Caaaaa for Cat or Uuuuuck for Truck so those would be the things I would look out for personally rather than worrying too much about a number of words.

I stressed that I had left things so long without doing more (I brought things up with our GP when she was around 2y3m) as she had such a high comprehension I wasn't really concerned with her being less than verbal but our speech pathologist reassured me that things were being addressed at a good time and it definitely hadn't been left too late so I don't think you have to worry too much about seeing how things go for now.

ETA: One other thing maybe worth mentioning though is that if you have to access things through the public system, I have heard you can be looking at long waiting lists so it might be worth thinking about getting things rolling sooner rather than later just to get her name down if it is needed. We had private cover for this sort of thing so from the GP, we were able to get her hearing assesed that same week and then into the speechie a couple of weeks after.