#1: Walk out to where you were working and pick up the parts you left behind, should be at least a cap or a cover.
#2: If you would have stated what model tractor it would really help with identification of parts that are needed to repair it and what is involved.
#3 First thing tomorrow morning call a Kubota dealer in your area and get it fixed. It's not going to be a cheap repair, looks like the casting is broken, use your money to fix it not hers!
#4 If you can not get it fixed, go to Uhaul rent a moving truck, pack quick and go into hiding, as She's going to kill you when she gets back!