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I know that. My solution is to send her an SMS to "land line" first to tell her to Switch the cell on. I don't know whether it is the same in other countries, but in .ch a SMS send to land line will be delivered... in the way a synthesized voice does read it
The first time I got an SMS voice message on my landline it was a female voice saying "Hi Dad, I'm going to be late - please can you come and pick me up". The confusion was that I did not have any daughters. So, I asked my son who had just arrived home and he said it was a text message that he had sent an hour ago, but had only just arrived.