Running 7-8 miles on a low deficit is ok to do?

5’1F 22yrs 103lbs

& normally 98/100lb range. But had shin splints so now I’m back to running 7-8 miles a day.

Will I have any heart problems etc running that much in a deficit?

Thinking maybe 1300 cal a day? This cut wouldn’t be more than 1-2 months I would say

I used to run 7.5 miles in a hour & lift being 96lbs (not knowing I was) but now my running speed is a little slower than that & I don’t lift besides leg day which I may switch for Pilates