I can't see any reason why not if they were both frozen just after you expressed them - they haven't been in the freezer for long so they're both still fine to use. It's no different to putting each one in a separate bottle and giving her one after the other - just make sure you shake it first to mix it up well because the milk can separate out, so you know she's getting the right amounts of foremilk/hindmilk if she doesn't finish the bottle
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