Well, she's not going to ask you to revise it off a partial. If she likes the partial, she'll request the full. She may find a major plot problem and at that point ask you to revise and resubmit. Or, she may sign you and then ask for minor revisions.Or she may reject it outright.
My agent asked me for less than a page of revisions, usually noting a mistake (and no, they don't toss you to the curb for one typo in 400 pages) or asking you to clarify a plot point to make it stronger/easier to read. That was it.
But you don't need to worry about that right now. Just make sure the partial meets her submission guidelines, double and triple check it for spelling and grammar and then send it in. She won't chuck it for one or two typos, but multiple spelling or grammar errors and your manuscript will probably hit the curb faster than a blind man driving a golf cart.