It's Llan
: higher not Llani (llan basically means parish in welsh) - i.e. the residence is in the top end of the parish
The image of Susannah's marriage reg is on Ancestry - I've given you all the details earlier, except the witnesses Thomas Griffiths and Thomas Morris
Hannah is a widow in 1871 living in Dyffryn Cottages Llangynwyd Higher. By 1881 she's moved over to Pontrhydyfen
there's a possible burial for Hannah
Hannah Thomas
Age 95
Burial 15 Dec 1894 Llangynwyd,
Address 125 Ystrad Road, Ystradyfodwg
Can't obvoiusly see her on 1891
Now have confirmation it's her - given her great age there's a newspaper report (in Welsh)
https://newspapers.library.wales/view/3117396/3117400/72/hannah%2BOR%2BthomasDEATH OF AN OLD WELSH WOMAN
It is our role to record the death of Hannah Thomas, aged 95. She died in the home of her daughter Mrs Rachel Davies, 125, Ystrad Road, and her husband Benjamin Davies, on the evening of Wednesday 12th. Another daughter is Mrs Anne Williams, wife of Thomas Williams, Clydach, Swansea, aged 71 and another child is Mrs Hannah Jones, wife of David Jones, Pontyberem. The departed was married to the late John Thomas, Carmarthenshire. he was buried in Llangynwyd Church near Maesteg 26 years ago. The old lady wished to be buried in the same grave as him, which took place last Saturday. A service was held before leaving the house by Rev D. C. Owen. She joined the Independents in her early years and she kept her faith uninterrupted to her grave
Rachel Hughes nee Thomas appears to have remarried - she's on later censuses in Ystrad with Benjamin, and both Hughes and Davies children (right age, and from Llangyfelach)