Re: Dual SIM phones
No, both could be called, as that's the whole purpose of active dual-SIM phones.
The 2G limitation just means you don't get a second internet connection, which most people wouldn't want anyway, so cutting it down to 2G saves cost and battery.
Phone calls and messages would work fine on both simultaneously. Sounds like exactly what she needs so you needn't worry.
Incidentally, back in the old days, Orange and Vodafone both offered a service via the GSM built-in "Line 2" standard that allows any GSM phone to have two phone lines and numbers on the same SIM
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