Well, I can't believe I'm already back home - I'm going to take DD to the GP tomorrow anyway to get a second opinion.
The doctor who checked her out just gave her a look-over, said her skin and alertness look okay to him and that it was 'probably' just wind, and told me to go home and come back if anything major happened :/ Fingers crossed he's right, like I said, I'm going to take her to the doctor tomorrow and hope that she does more than glance at her and go, 'Yup, she's breathing, therefore she's okay'!!

Thanks again for th esupport, ladies, DH thinks I'm overreacting but his eyesight's shot so he probably thinks I'm imagining it
The colour has faded to more of a grey-white shade though so I'll keep an eye on it