So I think its calcium deficiency.

Been doin some reading and I think my indica plant has a calcium deficiency. It's outside and planted in a mixture of compost, peat moss, garden dirt and a bit of chicken manure. Been outside since late may and this problem just showed up in the last week or so. Could it also be not enough water? It's been close to 100 for about a week and I'm givin her 1/3 gallon of water every day and mg once a week.

Is it just on a few leaves? if so could just be a leaf hopper sucking that leaf yellow. What kind of nutes you giving?

Any leaf with more than 50% damage cut it off

Mg sucks
You're overwatering
It's underfed
And yes, adding some cal/mag might help in the short run, but you need to get some decent nutes and give those roots time to recover between waterings

Good luck