Definitly check, but if she is having wet and dirty nappies chances are she is fine. My DS had a D&V bug when he was about 14 weeks old and it took him a couple of weeks to get back to normal eating.
If you think about yourself, you don't recover straight away it takes a while to get your normal appetite back, it's no different for babies. Also she may be having some stomach pains from the big she had so may not really feel like eating just yet. Keep offering her food and she will take what she needs/ wants and she should slowly pick up again over the next few days.
Laura