Ramya, no even Draupadi was not saved so easily. to begin with she held back to her cloths and was screaming for help from all those present in the Rajsabha starting from Bishma pitamaha, Guro Dronacharya, Ashwatthama, Vidura when she realized her husbands will not save her from their cousins. When she didn't receive any support from the those physically available there, she called Lord Krishna for help but still she was conscious of her cloths and didn't give in to her faith in her brother (Lord Krishna) completely, she didn't get any help. Only when she became totally desperate and help up her hands and called for him, he was there to save her. that means unless we believe in god and his presence completely and have faith that he will help us and save us and there is no need for us to clung on to our destiny, the God will not come to us to help.
For Draupadi, Lord Krishna, her brother was readily available to help her while for Ahalya, Ram had to born and come to save her.That is one reason (they both gave away their awkward feelings and believed in God and also never sinned, they are still remembered as kanyas (among pancha kanyas) and if we remember them daily all our sins will be washed out.
I agree jaya. Draupadi also went through all troubles but the time of help was quite fast as compared to ahalya's time span. Yes, both are among pancha kanyas but I feel something more to it. Though I am not sure, can you tell me about their previous birth incident something which may be the reason.