If it was me, I'd be taking her off to the GP to have her checked out. Sounds like she is feeling really unwell and I know I personally get concerned when DS shows signs of lethargy - he has to be really sick to want to lay around (that might just be him though). It's not that unusual for toddlers not to be able to clearly identify the source of discomfort either, so even though she can't tell you what or if something hurts, the fact that she is saying she is not ok would have me concerned. Hope she's feeling better soon