the not waving thing is the interesting thing for me.
she defintely understands, so that is good. (shoes)
she sounds very like dd who walked at 17.5 months. I was gearing up to go back to the health visitor, so remember.
she did not say much until about 22 months. (there was a lot of oh my goodness she is not going to make the 50 word at 24 months assessment) then onh my goodness did she talk. and get really interested words, and numbers... 
however, she does have hypermobility syndrome, (bendy and weaker muscle strength) and still has issues with movement and coordination. she hated tummy time, was at the later end of normal for physical milestones, bruises easily.
she also is getting assessed for autism. (the not waving, or asking to be picked up or pointing at objects were the early signs, but there were not enough to put together until she was 9 yrs to seek referral)
however, I would not worry yet. your dd is still in the range of normal. concerns need to be taken to the gp if she is still not walking at 18months and not talking sufficiently at 24 months. (ds had speech therapy as he did not hit the 50 word milestone)
and do not assume that your dd is like mine. just because mine was similar does not mean yours will have the same conditions.
my cousin did not talk early or much, then came out with a whole perfectly formed sentence when out with my mum, much to everyones amazement.