My sister was diagnosed when she was 18 months - I was only a couple of years older, so i don't remember what she was like, but everything you've said sounds familiar. We always knew when B had high blood sugar because she would be grumpy, coz it makes them feel quite sick. And we also knew when she had low blood sugar, because she'd be more clingy and emotional, and very quiet.

Its fairly simple to get your daughter tested, and the sooner you do it, the better it'll be for all of you. I remember Mum trying to teach Nana how to do B's injections so B could have a sleepover - she tried a million times on an orange, and then Mum asked B if it was alright if Nana did her injection. B was okay with it, so Mum put her on the table so Nana could do it in her bum, coz it hurt less there Nana drew up the insulin like a pro, didn't hesitate when she put it the needle in - and then took the needle out without injecting anything!

Get her checked out fairly quickly darl, hopefully its nothing but the sooner you find out, the better