She already was comfy. I'm 51 and I've never actually even heard of a job where you ONLY had to know a specific dialect of SQL. Also, you would think that mere intellectual curiosity would have taken her at least somewhat "abroad" in the knowledge sense, but I see no evidence of that, which means she was basically a corporate mercenary for 20 years who phoned it in. (Note: I've mostly worked for startups, so my standards and expectations about "job interestingness" and "job expectations" and "necessary intrinsic motivation" are possibly entirely different.)

She needs to find a giant corporation where she can live out her pre-retirement days in Storage Room B, only writing very specific SQL queries for Oracle, IMHO.

Data migration is not that hard, so the fact that she's balking at even step 1 says a lot to me.