Depends how big she is. I am BLOODY fat, with limited mobility. I am not offended by this conversation. I suspect op may be a joke but if not, and it's something that does worry her, as opposed to her hating fat people and looking for something to critisise - then what's the problem?
ok. do the very, super, mahoosively fat have mobility problems? Yes. I, for example, can't walk far, can't stand for long and certainly can't chase after a small child. My back hurts, my knees hurt and I get tired very quickly. However, I am unable to work. I would imagine that if this woman is in the workplace, she is not in as bad a situation.
Do the very, super, mahoosively fat have balance problems? Not as such. Your - what is it? centre of gravity maybe? is different, you carry yourself differently, you compensate, so I guess that could affect balance. Certainly if a thin person woke up tomorrow weighing 30 stone, they would find it a problem! But since it happens over time, you adapt. Although if you do overbalance, or start to fall, you have very little chance of correcting yourself, unlike the slimmer folk so you are more likely to go down!
Can the very, super, mahoosively fat see things at their feet? not always. Sorry, but it's true. Your, I don't know what it's called, line of vision? Whatever it is, it's different. When you look down it is like \ that instead of like | that. you do have a blind spot.
But tbh, if she was fat enough for the above to apply, I doubt very much she would be physically capable of working.
I don't see the harm in being truthful about it. Why pretend the super morbidly obese have no problems because of it, eat like birds and exercise daily?! We fool nobody but ourselves when we pretend like that!