I don't feel as though Res+2 is useful on most of the female characters and since most men can't learn it or don't need it (with DF's Res+10 combined with an All+2) it's kinda there until you get something better
I'm giving Demosielle a low rank because I use mostly female characters since more often then not they'll have the abilities I need for whatever map I'm playing and in terms of Streetpassing the only males ever use is MU and Walhart with the occasional Chrom!Inigo.
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It'll help Maribelle survive a magic shot until she gains some levels, but should probably be one of the first skills she drops.
Despite being gender-specific, that crit dodge bonus in particular can be a big help. Most of your pairs will be male-female, so simply switch the male to the front to get the most out of this skill - the gender-specificity isn't really much of an inconvenience.