if the belt is still in one piece and in place it could have jumped time when the toothed idler seized. and then when the ball bearings fell out of the idler and it unfroze, it COULD still be turning the cams. but this is all speculation.
wait for the report and see what they say. if it is anything more than just a timing belt, and i'm pretty you are, the shop costs are likely going to be WAY more than the value of the car. BUT that is not the comparison to make.
you have to compare the repair cost to ''what can i buy for that much money? and how reliable will it be?''
the cheapest way out is probably a 2.2L engine swap. you can buy one for $500 of less and have it installed for $500 to $750. but again, this is premature. you need the shop report.