Haley gets 20% of primary vote in Maryland, even when she dropped out.
Maryland Presidential Primary Election Results 2024
https://www.nbcnews.com/politics/2024-primary-elections/maryland-president-results
A person has to be registered with a party to vote in a partisan primary election.
https://results.elections.maryland.gov/voting/primary.html
So unless a large amount of democrats or independents registered as GOP, it seems that a sizable number of Maryland GOP residents are rejecting Trump. This does not mean they will reject him in November though.