“First, a fundamental purpose of the appellant’s fresh evidence is to explain her absence at trial and her motion. In order to succeed on her appeal, her explanation must be sufficiently cogent that it credibly excuses her absence and such that it would be procedurally unfair to allow the trial and motion orders to stand. The level of her inability to attend must obviously be serious to reasonably explain her absence. However, there is no requirement that she prove a certain level of incapacity including one that rises to the definition under the Substitute Decisions Act, S.O. 1992, C.30 or the Mental Health Act. We also note that incapacity for the purposes of the representation of a person under a disability under r. 7.04 of the Rules of Civil Procedure, R.R.O. 1990, Reg. 194, speaks to a person who is “mentally incapable … in respect of an issue in the proceeding” [emphasis added], not necessarily for all purposes in all aspects of her life.”