throw down at the microwave

so last week at work i was making my lunch. by making my lunch i mean putting some water in the cup-o-noodles cup. this lady sees me doing this, yet proceeds to put her bowl of rice in the microwave. i look at her, and i don't say anything, as i don't want to be known as the office bitch or anything. but she sees me just standing there the whole time she is microwaving her food. i mean shouldn't you ask someone if they are going to use the microwave before just plopping your food in when you see them with a microwavable food?