Need Advice Regarding Long Expiry Data Sim That Will Work with Telstra Dongle

I need a data sim for my elderly mother so that she can use whatsapp.
She doesn't want to change her mobile plan and she lives in elderly complex which doesn't have wifi.
She used to go library and art centre to use wifi to use whatsapp to catch up on messages and call overseas 3 times a week ie she doesn't want to be connected to wifi all the time, only when it suits her. She says it's too exhausting to have to answer messages all the time.
Since last year during Covid, we have had to come up with creative ways to keep her 'connected'. I have provided her with a free Telstra essential phone which I have sim hopped so that she was connected for a month or two but on a different number - with free calls.
She has had the Telstra data pass $50 per year for 5GB which she uses with my Telstra 3G dongle (white one). This used to do her but I dunno….I think she is enjoying youtube videos too much or forgets to turn apps off…and she has been chewing through data. Since Jan, I've already topped up twice!!

So I need some advice. I need a long expiry sim with lots of data which will work in the Telstra dongle.

Thank you in advance.

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