you are very very fortunate..147k on your timing belt is almost unheard-of....good for you..or your daughter.
yes..i strongly suggest to replace the timing belt A.S.A.P.
it is an interferance engine..you will put more than $60 timing belt cost OEM..instead of pulling the cylinder head and replacing alot of valves and related parts.
i'm lucky that my golfing friend is a machinest,and doing the labor for free and the parts at cost..
timing belt broke and pistons hit half of the valves,before it seezed.
i will be in it for aproximetly $300 in parts.
the car only had 87k miles..
i thought i heard 1st replacement of timing belt is at 90k miles.
good luck...change the timing belt..dont wait till it breaks.