My first migraine with aura came during my two pregnancies 7 & 4 years ago I found them sooo frightening.
I dont know what your symptoms are but I would suddenly notice that parts of my vision would be missing and then the classic zig-zag thing would come in my vision and then a headache an hour or so later.
I never experienced them after pregnancy until this last year when I have had several 'attacks' during my period for some reason.
My mum started getting migraine with aura when she was pregnant with me and has had them ever since (nearly 40 years!) so I imagine they can be heriditary(sp?).
Although my 7 year old son hasnt experienced the same symptoms he often complains that 'everything has gone small'. The opticians and gps were'nt much help so I googled it and it is called 'Alice in wonderland' syndrome which they say is a form of migraine!
I hope your daughter doesnt suffer too much with migraines but if she does it is common and although we may feel like nervous wrecks inside worry about them, hopefully if we can reassure our children and they will grow up to accept them and not worry too much about it and let it pass. Failing that my friend suffers from terrible migraines but has some fantastic medication from the gps which really help