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Hello, thanks for posting
The pressure on the low side will be high almost the same as the high side if the compressor is not running,
A sudden stop of cooling sounds like it's an electrical issue, there should be an a/c mc clutch relay in the fuse box under the hood, it's labeled in the cover of the fuse box, try another relay in it's place, there should be one in the box that works, the horn relay is the same.
It's also possible that the a/c clutch is the problem, can you tell if it turns on or cycles on and off?
If it has auto climate control the compressor is controlled by a separate computer whci has the aility to store diagnostic codes, this is going to need dealer attention so I will opt out.