Frozen was still in the top ten domestic box office earners, up until the week of its home video release .. at
#8 the weekend before, and dropping to
#11 the weekend after.
Even now, it's still at
#15 in those rankings .. not too shabby, for its 20th week in release..!
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It's very likely the current Blu-ray/DVD release was pretty much authored & ready-to-go-to-press before
Frozen was even premiered to theaters .. and the home video release-date was probably 'locked' before then, too.
Still, after that first month or so of box-office frenzy .. you'd think
someone at the studio coulda/shoulda leaned on BVHV to push their DVD/Blu release into summer, at least.