Went through the same thing with DS. Hated baths until about 8 months. Then loved them until about 1 1/2. I think something happened when he spent the night at my in-laws. They said they'd given him a bath and the next time I tried he freaked out! The second round of hating baths didn't last long. Maybe a few weeks.
Maybe try buying her some cool new bath toys or even just new stuff from around the house that can go in the bath. Also, look for her cues, is she scared of the drain, the faucet. Or if she'd rather sit in the bath while it fills or wait until it's full to get in. Good luck. I'm sure it will pass soon.
13 months old and hates the bath all of a suddern?? 
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