Many people run in the the 20's and 30's constantly
It's long term damage that we're mostly concerned with, a few days in the 20's is negligable, but there are short term issues too.
Give the diabetes nurse a call. She should be starting insulin immediately. But if she can't get in, keep her as hydrated as best you can and monitor her weight. If her lights are on but she's not there (ie very unresponsive), get her in. If she's dropping say 2lbs a day, get her in. If she starts to smell 'fruity', get her in. Also restrict her carbohydrates, especially juices, to nothing. Meet/fish and veggies, preferrably salads, only. Lots of water.
Maybe at least get some strips to test for ketones. I suspect that's what the urine strips are for. High ketones is the real danger. I've never had them, so I really can't help there.
