Thanks. :-)
I was able to (somehow) get the file size down to where I could use PKHeX. I did that, switched the extension back to .srm, and the game started up fine and showed the Seel in her party.
Problem is, when she goes to look at the Seel's "Summary" screen, the game freezes. Not sure if that's a known issue of any sort, but we're packing right now to leave for the weekend. If anyone has advice, that's great, and I'll be able to check in a few days. If not, thanks anyways for the help so far.