Thanks Riven 
She does not roll, nor did DD1 and DD1 was late in crawling and walking but early talker so I have not been so concerned about the not rolling and sitting but the not reaching for anything worries me. She is very smiley, everyone comments on it, very happy and easy going in general.
If you lay a toy in her lap she will half heartedly feel it but if you hold up something she just looks at it and her hands/arms do not move at all. Nor does she reach for anything in front of her if she is sitting.
I weaned DD1 at six months and she was able to sit and pick up the food, DD2 is no where near that and is 6 months in a couple of weeks.