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That marriage was on 4 May, 1852 in the Catholic Parish of Dunleckney, townland Ballyellen and can be found here; https://registers.nli.ie/registers/vtls000634458#page/54/mode/1up, at the NLI Catholic Register. Incidentally I have two more baptisms; Bridget Conway, 11 February 1855, and James Conway, 22March, 1857 in addition to the baptisms you mentioned in your post. There may be more, these are just what I have now. These will be in the Dunleckney Baptismal Registers in the NLI collection as well.

The following is the marriage date of Thomas Collier and Margaret Tracey, 7 January, 1846;  and the the rest are baptisms of their children; 12 Mar., 1843 (illigt); 20 Jun., 1847; 14 Jul., 1850; 3x? May, 1852; 27 Aug., 1854; and 23 Mar., 1857. The sacraments were all taken in Ballinkillen, Lorum. These primary sources can be viewed on the NLI Catholic Parish Registers for Dunleckney Catholic Parish. I stopped transcribing after 1857 because the registers were unreadable, i.e., there may be more children.
There is also a marriage entry on 30 October, 1830 for Thomas Moore and Margaret Collier in Kilgraney. Kilgraney is in Lorum Civil Parish,not unlike Ballinkllin
I have no doubt that these are your peeps.
You can find these entries at Carlow IGP, Dunleckney Baptism Registers. The marriage register can be accessed at the NLI Catholic Registers, Dunleckney