Entertaining seeing that the first posts in response to an inquiry explicitly framed in terms of protecting a _child_ contained intentions more to protect the _laptop_. Interesting that many suggest "teaching" her that computers ought not be jumped on (probably to her perception, at that age, under any conditions), and the worst of them suggest disciplining her for it.
I don't know of a case that would make the behavior safer, but I might hypothesize that when the child sees you engaging with the laptop (which likely does not appear to her at that age to be an expensive thing she might break) she, at this stage in her life, feels a want herself for engagement.
It doesn't seem to me to be the laptop she's after but you. I suggest staying alert for her approach and when you notice its initial stages, set it aside and engage her. Perhaps, alternatively, there is an enriching activity of some kind you could immerse her in when you're working at the laptop--if you've not tried to immerse her in something during the time you're using the laptop already.
Eventually I would assume she will grow out of it and more engaged not with direct bodily or loving attention but with her own activities.
edit--I understand that this sort of response is not very compromising to very valid concerns of your own about balancing your time with watching her and with doing your work, but I think it ought to be pointed out that many other responses presuppose a different cause for the behavior (and a different morality for it) and some solutions that might do more damage than good, potentially for the child and the laptop! Considering the (normal) psychological/interactional causes might at least help conceive of solutions that don't necessarily tax you but are nonetheless effective.
