She is two and a half and I have noticed a habit of very repetitive behaviour, but more importantly she gets very upset when her fixed routines or habits are altered in the slightest. Even down to the way she is taken out of the car (if her side is blocked in and she has to be taken out the other side, she is very upset), or having to see the very end credits on a DVD (she doesn't mind about watching the whole DVD, but if she is taken away before someone has fast-forwarded to the end credits she gets quite agitated and upset). She is not self-feeding yet (much later than the other kids I know, but I could be wrong about this, it's just my personal experience) and has to have certain songs sung to her in a certain order otherwise she will not sit down to be fed.
Her father, arguably, exhibits some of the characteristics of Aspergers, but is undiagnosed, so it could just be his personality, learned/inherited by his little girl!!
I am just worried because it seems to be becoming a real issue in her day to day life, the agitation is not like that of my godchildren or other nieces, which makes more 'sense' iyswim - they get upset if a favourite toy is taken away or if they are told to stop watching TV to go for bathtime. There seems to be little rhyme or reason to my niece's form of agitation, only relating to how her patterns and routines are disrupted.
Am I over-reacting, is this just a normal part of toddler behaviour?