Hiya
Mia (my 1 year old rottie) suffered a lot with water infections when she was a pup - at first i would take her to the vets and he would give her anitbiotics - but i soon realised that if i could get her to drink a lot of water it washed it out of her.

Also, just another thought - you said you were at the beach - was she drinking salt water? I remember giving our male staffy a bit of gammon once and it made him wee loads!!

if i were you i would make sure she gets plenty of fluids and see how it goes. Good luck!

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Kelsie