You're right, the first thing I thought was is she hearing ok?
I tend to think that all LO's are different and develop at their own pace etc etc... But to answer your question, my DS was doing all of those things at 20 months.
Do you think you might be focussing too much on what she's 'not' doing, rather than what she 'is' doing? Just a thought, but sometimes when you're concerned and looking for all the typical milestones that other LO's are making you can miss other more subtle achievements that they're making...
Mind you, that said, I'm a big believer that if you have a concern it's far better to explore it and get answers than sit and wonder. Particularly if it is a delay of some sort, the sooner it is identified and being worked on, the less impact it will have on the rest of her life iykwim?
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