Not in her case, her husband isn't Mormon.
It's an interesting situation for her. Mormon cosmology has no real place for her unless her husband is posthumously baptized. Even then, her ascension will be limited because she's bound to her husband and not a good Mormon man.
She won't get her own planet. The husband and his celestial wives would get a planet. The only way she could get in on planet ownership would be if her husband died and she married good Mormon man.
I don't think that would be the official answer, but it's a good question. Needless to say, my wife is in the same position, and the way she's always explained it to me, is that if she remained a faithful Mormon, upon her death, there would be two options:
1) I would have a chance to convert after my death, whether or not baptism-for-the-dead was done for me. (edited to add: it's my understanding that people are told baptism for the dead is necessary for the dead to be converted, but it's my understanding that this is fudged, because of course there are many people for which there are no records of their existence, and they shouldn't be punished for being born into a pre-literate society, for example. So there's something about all records being available in the end times so everyone can be baptized. So I mean that baptism for the dead doesn't
need to be done now, but would be done eventually, but of course it would certainly be encouraged for a spouse to do it for their deceased non-Mormon spouse).
Option #1 is usually promoted as the most likely option, because of course after I die and see that everything is happening just as the Mormon church predicted, why would I still not believe? So she and I would remain married in the afterlife and be god and goddess of our own planet, and have children then although we have no children now. Presumably I would also have the option to take another wife too, if she agreed and I wanted to. (Edited to add: It's my understanding that if I converted after I died, I'd have all the privileges as if I converted while alive.)
2) I would not convert, but because she was faithful, she would be rewarded with a faithful Mormon husband. She and he (and his other wives if he had them) would be god and goddess same as above, and part of my "punishment" for being a non-believer would be being separated from her as well as from God.
She's not here right now or I'd ask. I could go googling LDS scripture, but anyone care to comment if that sounds right or is way off base?
Edited to add: Apparently that's "meat," not "milk," LOL! Ironically, in a quick google, I'm getting way more hits about temporal concerns than eternal ones, when googling things like
what if an lds member marries a non-member.
