it's possible. And if it's likely to happen, SHE WILL ALREADY KNOW. If she's scared to do it, there's a reason, and respect that. It's not complicated.
This is: if you have a friend/relative w a nosy husband, go out for girl time & make voting alone *available.*
But an astonishing amount of it is just social control.
This is a style of patriarchy & domestic abuse whose primary tools are shame, isolation, excluding women from community decisionmaking, & setting women up against each other as competitors.
As a result, most (most) Mormon men don't have the stomach for it.
Their entire MO is built on a persona of benevolence. Physical violence takes the whole house of cards down.
The notion that domestic abuse means physical beatings is, in itself, one of the most powerful social tools that conservative culture uses to control its women.
While they shame, gaslight, control all the $, ignore their kids, make decisions for women to carry out, commit marital rape, sabotage birth control, etc.
But also? Don't ASSUME it's unsafe for her to vote solo. That's not how a lot of conservative abuse works. Make paths.