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She is short and 20th floor button in the elevator is too high for her to reach so either she use umbrella to press button or ask someone in elevator to press for her. Otherwise, she can reach maximum to the 10th floor button by herself, so she use elevator up to 10th floor and rest she walk.

Step-by-step explanation:

As we know woman live in 20th floor and she use elevator to get on floor 20.

We assume she is short and she use umbrella in rainy days.

Case 1:

If it rains, she will have umbrella which she may use to press button of 20th floor as she is short to reach 20th floor button.

Case 2:

If there is someone else in the elevator with her then she may ask that person to press the 20th floor button for her,

Case 3:

If it is not raining and no one else is there in the elevator, then she is able to reach maximum at 10th floor button in the elevator by herself, so she get off at 10th floor and take walk or stairs to rest of the floor.