Not in the office today

Today I do not have to go office because boss requested me to help her to do some personal work. In fact, I do not like to do that kind of work but I have no choice to accept her request.

How could decline boss's request? Seem like impossible to me especially when she keeps telling me she can't find other people to help and LOOKING FORWARD for my help. hmmm.. I wish I could decline her request actually. But my heart is too soft to agree it.