A summary of Katherine's will is on the Kent archaeology website, in the section of abstracts of Lambeth wills [http://www.kentarchaeology.org.uk/Research/Libr/Wills/Lbth/Bk22/page%20122.htm]:
Katherine Wallere, relict of Thomas Wallere de Lamberhurst, 10 March 1423. To be buried in the church of Lamberhurst. To the high altar 13s. 4d. To the clerk there 20d. To the work (opus) of the said church 20s. To the Abbot of Begham 20s. and to the Convent there 20s. To William Wallere my son, monk of Batayle 20s. To Ralph my son 10 marcs. To Katherine Mawfeld my daughter 10 marcs. Residue to John Wallere my son, executor. The Probate Act is missing. The Will before was proved 7 August 1424. (374b Chichele I)
Katherine's son William Waller became the abbot of Battle Abbey in 1435 and died in 1437.
Parts of this will are also included in Walter H. Godfrey, ed., Transcripts of Sussex Wills as far as they relate to Ecclesiological and Parochial Subjects, up to the year 1560, transcribed and classified by R. Garraway Rice, Vol. I-IV. [Lewes: Sussex Record Society, Vol. XLI-XLIII, XLV, 1935, 1936-37, 1938, 1940-41]:
"Katerina Wallere of Lamberhurst, relicta Thome Wallere de Lamberhurst, 1423-4, March 10. No P.A. Lambeth Arch. Reg. Chichele, Fo. 374b." [Vol. III, p. 73] "lego summo altari eiusdem [Lamberhurst] xiiij s iiij d." [Vol. III, p. 74] "lego ad opus predicte ecc'ie [Lamberhurst] xx s." [Vol. III, p. 75] "lego Willmo Wallere filio meo monacho de Batayle xx s." [Battle Abbey ] [Vol. I, p. 99] Frant, Bayham Abbey "lego Abbati de Begehm. xx s. Item lego conventui ibidem xx s." [Vol. II, 201] Lamberhurst "Clerico ibidem xx d." [Vol. IV, p. 433]