Hello Anthony, I can find Margaret's baptism in Darver (no civil records pre 1864) she was the last of a number of children, Pat 1842; Cath 1846; Thomas 1851; Andrew 1856; John 1858 and your Margaret in 1860. If you wish you can view the actual entries here but can only search by month and year and a tricky read at times. https://registers.nli.ie/parishes/0207
I am unsure as to why you think she was born in Drogheda and what source, Drogheda is about 18 miles south and was a major migration port to Liverpool so no passenger records from Ireland. I could not locate a marriage on Roots Ireland, but see in the parish records they are sparse.
If you Google in the book section there is a 1903 publication (reissued circa 1988) of the Kilsaran Union of Parishes and includes some Darver stuff. Lurgangreen appears to be located just south of Blackrock, Louth on the coast.
You may enjoy this site http://jbhall.clahs.ie/ on Louth. I can see no entry in Griffiths Valuation of 1854 that may be part of the family.
There is a Facebook page called Louth Genealogy, private but well moderated and it may be your best bet to locate living relatives, if you are thinking of Drogheda Down Memory Lane - Lost Family (not overly active pages) the sister site Drogehda Down Memory Lane much more busy but not really a genealogy source. If you have 10 spare minutes and interested in Drogheda there is video of old photos on Youtube called Ghosts of Drogheda.
Boylan is a name in the area, see 123 persons of that name in the 1901 census in Louth, mind you that is not a lot as there may be say 6 in each family, there are none that appear to live in Darver.
Please revert if you have further query.
Good Luck
Pat