Carrie Underwood “wasn’t really interested” in performing the ‘Sunday Night Football’ theme song when it was first offered to her. The 41-year-old singer has performed the NBC theme song for over a decade now – but Carrie actually rejected the opportunity when the idea was first put to her. Fred Gaudelli, the executive producer of NBC’s NFL coverage, told Yahoo: “We reached out to Carrie, she wasn’t really interested.” Carrie admitted that it simply “wasn’t the right time” for her. However, the blonde beauty did finally accept the offer in 2013 and she’s relished the experience ever since. She…