How much is the present value of her potential pension? Even if vested at 4 years rather than 5, I suspect that any value of a marital share would be pretty negligible at this point. You would not be entitled to 1/2 of the full value of the pension at retirement, but only 1/2 of the present value and its growth.
Just to give you an example, I have many tax clients who have pensions from companies where they worked for only a few years after being vested, and many of them receive only tiny amounts of money a month...because the payout is over their expected lifespan.
You don't want to spend any significant time or legal bucks if any pension payout at retirement is going to be 35.00, monthly, for example.
Therefore I would be looking at the value of the pension account now, and if its only a few thousand, I wouldn't spend a great deal of time or money trying to divide it...because the future payout won't be worth it.