Is it possible she has an ear infection?  Or maybe a mild concussion?  Both of these have the symptoms you describe, and being 2, it is even possible she is getting her 2 year old molars, which can be very painful.

Having said that, if you suspect that something is seriously wrong, you need to get her checked out as quickly as possible.  I have had a quick look at some sites that are about Shaken Baby Syndrome, and I will put the link to the Google search page under your question as that seems to give a lot of interesting and infromative sites.  Too many for me to list individually.

Follow your gut instinct and talk to the doctor both. This could be one of several issues.

It  may just be down to a change in routine, I know that even now my nearly 4 year old daughter can be grumpy and not herself if her routine has gone out the window.

If she continues to show symptoms of being "unwell" then I would take her to the GP.

see your gp.

well i hope thats not the reason for all this....im not sure what the symtoms are...but she could have an ear infection?? My son was known to having these so much when he was younger and he always was grumpy,loss of balance, whingy, and totally not himself when he had one....i would take him to the dr and yes,yet again,another ear infection....i hope this helps...get her the the dr if there is no improvent in the next 24 hrs sweetie....

naomi xx