Hi Ellen, if your starter is still bubbling then I wouldn't give up on it yet, although it won't contribute any rising power to your baked goods until it resumes rising perdictably. It may help to put it in a warmer spot (75-80F), and feed it twice daily for a few days. Once it starts rising again, be sure to feed it when it's at its peak of rising, or just beginning to fall. This will keep yeast activity vigorous. Allowing the starter to fall significantly between feedings can lead to sluggish yeast behavior. 

The one thing that is sure to kill your starter is heat, so if you can't think of a time when it was exposed to excessive heat (140F), then I think there's definitely hope for a full recovery! 

Good luck, and let us know how it goes. 

Barb

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