she bought it on ebay uk
The general rule is that unless the amount claimed is over £15k it isnt worth sueing someone cross border.
It is unlikely that being out of date caused this problem.
Even if this was in UK it wouldnt be an easy case to bring and from Russia virtually impossible.
I would probably refund but make sure that she knows you are admitting no liability and simply refund as gesture of good will.
I wouldnt worry on these facts.
Can I help further?
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Thank you so much for your help.