"The decision to add 15 more shows was a no-brainer for me," she said in a statement.
The legend will play six shows starting next May.
The 2010 merger has been subject to scrutiny for allegedly leading to higher ticket prices and claims that Live Nation Entertainment is abusing its market power over venues and artists.
Lincoln arrives from The Kia Forum following the promotion of Rich Best to Live Nation's global concert team.
Singer Will Toledo's band has also pulled out of the When We Were Young festival.
Gigs in North Carolina, South Carolina and Florida have been iced after Josh Kiszka ruptured his eardrum.
The British singer-songwriter hits 250 shows of his final tour, with about 50 more to go.
Haitian band Boukman Eksperyans will take his place.
Brian Tarney and Liz Garo from Spaceland Presents hope to find their groove with the new company, which is also producing a forthcoming New York music event called Flesh & Steel.
Under the deal, Marcus Allen and Brandon McEachern join Live Nation Urban in executive roles.