The 2024 1099-R should be reported on the 2024 tax return.
The good news is that Code G in box 7 means the distribution was a rollover from one qualified account to another qualified account, so there would be no tax due. If your wife took an actual distribution as cash in 2025, that wouldn't be what's reported on the 1099-R that you received. You should receive another 1099-R for 2025 with that distribution.
