Not really phrased as a question, but it seems unlikely that they'd be asking anything other than 'When/In which episode was the last appearance of Amy Pond?'
Still, it's not too clear. I'm sitting on the fence when it comes to tagging this question for claification or answering it on an assumption.
I think it does need to be clarified. It's not certain that it's meant to be a question at all. It could be an attempt to search for an existing question & answer.
If it is meant to be a question, the meaning you propose is by far the most likely but we've occasionally had questions of the form "Was episode X the last appearance of character Y?" & that's a disguised way of asking about the future. It's the same as asking "Will character Y reappear in any episode after episode X?" That's something we can't answer.
If you're confident you've got the intended meaning, don't just answer on that assumption. Rephrase the question yourself (& give the reason as "Clarity" or suchlike), then answer it. That way, the question complies with policy & the answer fits the question.
If it then turns out that the original asker meant to ask something else, he/she can either say so here or post a clearer version of what he/she really meant to ask.
BTW, even if you're right about the intended meaning, what appeared in "The Time of the Doctor" was a vision or hallucination of Amy. The last appearance (so far) of Amy herself was in "The Angels Take Manhattan". The answer ought to give both pieces of information.
As I say, though, I think tagging for clarification is best & I've done that. If you want to clarify it yourself, go ahead. --220.127.116.11 15:38, November 22, 2015 (UTC)
P.S. If you rephrase the question (or anyone else does), "last" should be changed to "final", since "last" is ambiguous (as pointed out in DWA:MEANINGCHANGE). --18.104.22.168 15:43, November 22, 2015 (UTC)
Sorry for not responding to this or anything else you may have sent me over the last few days - I've been extremely busy with other things.
I think you're right to ask for clarification, and I wouldn't clarify it myself since we don't know for sure what the asker intended.
That's fair. After all, it's what the asker intended that matters most. --22.214.171.124 05:47, November 24, 2015 (UTC)