Hi Cassiopeia, as long as your oven wasn't over 120-140F, I doubt you did any permanent harm to your starter. To get her back to her funky self I would recommend a few days of twice a day feedings at room temperature. I don't know how cold your house was overnight, but generally temperatures in the 68-80F range are fine. If you're worried that your oven with the light on was too warm, try boiling some water on the stove and then sticking it in a pyrex cup in your microwave. This will warm up that small space and will get your sourdough starter off to a cozy start on a cool night. 

I hope this helps! Let us know how it goes. 

Barb

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