Hello Giants,
for me..as long as trina has a genuine relationship and a loads of evidences it will not be a problem as long as the ECO will satisfied about it i apply for a fiancee visa and after 2 years and 6 months then we decided to submit our documents to the ukvacs, i think the more evidences u show , the more chances to grant ur visa , so no worries for trina's application ....
goodluck!