During those parts of Dracula where all the men tell Mina to stay behind because it’s too dangerous even after she was the one who figured everything out, I wanted Mina to go and be on her own secret mission to kill vampires. I have a headcanon that after she had kids and supposedly settled down with Jonathan, she still went out and hunted creatures of the night.
The first version of Dracula I read was a kid version with awesome artwork, and their interpretation of those scenes was that the guys decided that as they might all get killed via vampire, one of them shoudl stay behind to carry on the work. After a short argument, they all agreed that Mina was the only one awesome enough to qualify for this role.
I still way prefer this version.