Hi Sue
Don't know if this is info. you already know, but according to Freebmd Susannah Clennan married Andrew John Heatley in Sept Qtr 1900 Reg: Castle Ward Vol 10b Page 523.
They appear to be in Kenton in 1901 Census along with Jane Clennan aged 7 years, place of birth: Kenton. Susannah's birth place is stated as Dumpling Hall Farm, Nbld and is aged 25 years.
Freebmd only has one birth entry for a Susannah Clennan and that is Dec Qtr 1873 Reg: Chester-le-Street Vol 10a Page 583. I can't find her on 1881 census via familysearch.
I hope that this info. is of some use to you and good luck in your search!
Best regs
Janeen