Margaret Corkill als Corlett's will is listed on BL's index as:
CORKIL, Margaret 1705 Braddan A 18 0106209
It has no dates on the transcript.

Her burial on both Brian's index and on the IOMFHS CD has:
CORKILL, Margaret Braddan 9 Apr 1707 CURLET.

Does anyone have copies of the Braddan par reg film, or alternatively photos of the will film or index to see which year is an error?

I suspect the will may have been written in 1705, and went to probate after her death in 1707, although in that case I would expect the dates to have been included.
The Arch wills film number 106209 contains copies 1705-1710, so the year could easily be missed.

Thanks,
Sue