Her TA was 180 a few days ago.

Composite:
TA = 180
CH = 270
CYA = 160
Given a CYA=160, as long as your pool is algae free, you need to keep your FC between 8 and 16 ppm. Don't worry about CC, so long as it's only 1 drop of FAS (0.5 ppm with the 10 ml sample size).

So, to respond to your question, your chlorine is fine, except a bit low.

Given your high TA & moderate CH, you need to lower your TA a bit. If you would lower the pH to 7.4 or so, and retest TA to confirm. To lower, see http://pool9.net/ma/

I looked at your data, and recalculated your volume as 6,300 based on the dimensions you provided. If the depth measurements were pool depth, rather than water depth, the actual volume is even less.