Maughold marriage register has:
4 Jan 1900
Alfred Edward CHRYSTAL 34 Widower Auctioneer Lezayre [father] John Chrystal (dec), Auctioneer, and
Catherine Christian KISSACK 22 Spinster Maughold [father] William Kissack (dec), Farmer.

Registered births on Brian Lawson's website include CHRYSTAL, Edith Kermeen 24 Mar 1900 Ramsey [father] CHRYSTAL, Alfred Edward [mother] KISSACK, Catherine Christian.

So I assume Leonora's birth would have been recorded in Ramsey as well, and the bapt there rather than in Maughold Church.

Sue