Edward McHugh Wife?

Hi i’m just looking help trying to figure out who my 3x great grandfather Dominick McHughs mother was. I know his father was Edward McHugh that died in Feb 1881 registered in omagh as he was on his marriage record but i can’t seem to find out who his mother was. His mother was deceased by the time that his father died. Only record that seems plausible is a Bridget McHugh who died in 1871 in omagh insane asylum i don’t know how to go about finding out for sure. I was thinking of getting in contact with proni to see if they hold any records on her stay there i’m not sure if that would hold any info on her family possibly? any help would be appreciated thank you!