She actually helped her own downfall in one of her own ads.
To make herself more 'common & folksy', she mentions about how she was married at 19, had kids, was dirt poor, finished college as an adult, etc etc. and many individuals realized that Warren makes a lot of stupid decisions.
She torpedoed her own campaign almost as effectively as Coakley- which is why she has been silent. She is hoping that people forget her first poorly thought-out campaign ads.