acidic milk & diaper rash?

My daughter (11m) has had a GI bug for the last two weeks (dr is aware). She hasn't had diaper rash... but the last 2 days it appeared out of no where. It dawned on me the last two days I've eaten an orange for the first time while breast feeding. Is it possible those oranges changed the acidity of my milk, causing more acidic poop, therefore diaper rash? Or is that crazy? This is the first time ever she's had it, and it's really bad. Been trying creams, breast milk, baking soda baths, etc. Anyone else experience this when eating acidic fruits?