Poor V... i read the immunisation sheet and it said a reaction can occur 5-12 days AFTER the needles with the MMR one.. it's less likely to be an immediate reaction, symptoms can include:

1 - High fever over 39, 2 - Faint red rash (not contagious)
3 - Head cold and/or runny nose 4 - Cough and/or puffy eyes
5 - Drowsiness or tiredness 6 - Swelling of the salivary glands

Ava had a high temp, runny nose, seemed a bit tired and is off her food so i am matching it to about 4 symptoms?