When I was looking at LDS a few years ago I found a Marianne Geddis b. Antrim 4th qtr. 1896 ref
1 - 679 but was then told not able to access that. Would I be able to if I sent that ref. number to GROireland or GROuk (not a lot of faith in the latter, they couldn't work out that Samuel was the same as Sam even with the ref. number when sending for my paternal g.father's birth cert.)
This birth registration you found sounds very likely to be her. That explains why the Family Ulster said nothing because they were following your instruction that you were looking for Anne Geddis.
Right year, right place of birth. Ummm....
Wait until you get ahold of 1901 Census and see what you find.
Thing about the reference number they are only good if you order from the GRO in Belfast, the GRO in Roscommon do not do that. Both GROs do need the reference number for the marriages.
I think you are onto something now. I would like us to wait for 1901 Census.
When you apply for the birth certificate, please try to spell her father in full as both GROs are sticklers for the exact information. If I were you, I will just fill the form out that you are looking for a Marianne Geddis born in 1896 in Co. Antrim and the parents are unknown. BUT we do know who her parents are, right? So better to add father's full name. We will work together on this one when we get there.
Good luck and have a fun at the LDS centre.
Cheers,
Tees