No, it's 40 (forty) quarters, not 4 quarters. 40 quarters is 10 years.
There's a third option I just thought of too. If you want, change the owner of the business to her from this point forward. You obviously will qualify for social security. So if from here on out if she's listed as the business owner on your joint return, everything gets credited to her account. You already have 180 quarters (45 years) so you're set.
