It is common to use that much Borax....trichlor and dichlor are very acidic, so there's no way to know how low her pH actually was. Keep at it with the Borax until you get the pH up above 7.0.

As the algae dies and begins to be filtered out, she's going to need to backwash her filter--probably more than once, so she really needs to get a new gauge on it ASAP.

Keep the chlorine levels up at shock level until you can measure at night and again in the morning before the sun hits the pool, and lose 1 ppm or less of chlorine. At that point, you/she can let the chlorine levels drift back down, but how far will depend on the CYA level.