Answer:
LTCL = $0
Basis = $3,575
Explanation:
January 15, 2018, buy 1,000 shares at $5,100
December 31, 2020, sold 1,000 shares at $4,550
If Ms. Fresh hadn't repurchased the stock in January, she could have reported a long term capital loss of $550. But since she repurchased the 1,000 shares just after selling them, it is considered a wash sale.
So no long term capital loss will be recognized and the basis of the 1,000 stocks = $3,025 + $550 = $3,575