You need a really apocalyptic situation for that
Do we? I mean, again, fiction. We are putting
a lot of weight on a short paragraph of words said by Sigrun Gard, without any real contextual explanations, who is an employee of one Mr. Kringle. She's a pretty straight person, but I'm pretty sure that if she had gotten instructions by her boss, she might have not been 100% truthful.
Not even to mention that there are a ton of work-arounds which could be done. Oh, she comes back as a Valkyrie, which is
different from being an Einherjar, golly gee wiz. Oh, her being so catholic and being a former Knight of the Cross makes her a
special case. It's easy, it just depends if Jim wants her back or not.