From the article in the OP:

Kilpatrick was reported to have raised more than $512,000 for the race that included over $23,000 in last-minute donations from Moroun, his family and employees, according to the Detroit Free Press. He was her top donor for the campaign and for several previous campaigns.

First elected in 1996, Kilpatrick is a key member of the House Appropriations Committee and has been known to frequently advance Moroun’s interests in Washington.

“She was making decisions on behalf of special interests,” said Basham, who has been a leader in Michigan to win approval for the competing DRIC bridge proposal.
That alone is reason for her to be investigated and possibly face chaarges.