Worrybynature, I'm normally the first to 'flag' SN I see on MN. I have to say to you, though, that while you should go by your gut instinct, what you see now isn't necessarily a good predictor of the future.
DD1 at 12 months: Several words, pointed, waved, clapped, used to lift her feet up for kisses, etc. Motor skills behind a little, but not much. Thought she'd be walking by 13/14 months.
DD1 at 15 months: Pulling to stand but foot turned out.
DD1 at 17-20 months: Seen by physio for 'neurotic mum syndrome' and discharged at 20 months. Not yet walking.
DD1 at 23 months: Finally started walking. 'Neurotic mum syndrome' confirmed.
DD1 at 2yrs 6 months: Started preschool and 'Neurotic Mum' was nervous of how they would keep her safe.
DD1 at 2yrs 9 months: Flagged by preschool 'immature' and 1:1 given.
DD1 at 4 yrs: Statement arrived.
DD1 at 4 yrs 9 months: Special School.
However, if you saw her at 12 months, none of the 'flags' were raised. I know many 'normal' children who had red flags at 12 months, by contrast.
The best thing you can do is go to your GP/Health Visitor with a list of your concerns and ask to be referred to a Developmental Paediatrician. They will check her over, ask you some questions, and either send you on your way or say 'well...you've got a point.'