Lislea is the townland where Lower Killevy RC chapel is situated.
Ann's death looks to have been in Glasgow in 1908, aged 66. There is a death that year in Gorbals, Glasgow indexed under Ann Feron & Ann Trainor so that fits perfectly. You should get her parents names from that (assuming the informant knew the information).
A Patrick Fearon died in Penicuik in 1886 aged 50. Penicuik is near Edinburgh, so some distance from Glasgow. Not sure if it's the correct death but it's the only one I can see.
Variations in the spelling of the surnames is very common.Many people were barely literate and so couldn't spell, but even when they were literate, accurate and consistent spelling just wasn't something they bothered about in the 1800s. Expect the spelling to vary. Use wildcards or shortened versions eg Fer* when searching the records.