Question:
While a woman is a nidda, may she grab onto her husband if she feels that she will fall?
Answer:
While she is actually slipping she may grab on to her husband to save herself from falling, as she is allowed to save herself. However when she is walking on the ice she should not be using her husband as her support from slipping, she as well as he should find some other way to prevent themselves from slipping.
Best Wishes