The Collaborative International Dictionary of English v.0.48:

Mauther \Mau"ther\ (m[add]"[th][~e]r), n. [Cf. AS. maeg[thorn] a
   maid.] [Also spelled mawther, mother.]
   A girl; esp., a great, awkward girl; a wench. [Prov. Eng.]
   [1913 Webster]