If one had 1 Jell-O shot (1oz) and three sips of mikes hard lemonade are they likely to test positive 36 hours later

Oh yes. It's up to about 4 days give or take a few hours.

But why worry about it now since you weren't worried about it when you took the jello shot?

Exactly.. if you are going to be tested, then abstain until you no longer are. Otherwise own up to the risk and stop worrying about how much you can get away with until you get caught. Seriously it IS easy to do... and you save yourself a ton of stress and the repercussions if and when you do fail. Whatever they may be in your case.

Hmmm... assuming that you are asking the question due to being tested, are you asking about urine EtOH or urine EtG testing for alcohol? BIG difference.