Processing speed figures formally into the global measure on the WISC-IV/V, WJIII/IV, is in supplementary measures on the DAS-II, and is not assessed on the SBV and KABC-II. Index scores without processing speed can be computed on the WISC (this would be the GAI) and WJ (Thinking Ability), but will also remove working memory from the equation.
In addition, processing speed affects some subtests that are not primarily measures of speed on the WISC (mainly in the visual spatial and fluid reasoning areas--formerly combined as the perceptual reasoning domain on the IVth edition), and, slightly, subtests on all the others.
Working Memory is formally included in the global measures of the WISC, WJ, SB, and KABC, and in the supplementary indices of the DAS. Again, on the WISC and WJ, global measures that include working memory will also include processing speed.
So if you want to limit the impact of processing speed, but highlight working memory strengths...well, you're not in luck, because they tend to be grouped together in the cognitive proficiency/efficiency clusters.
Your anecdote sounds more like visual spatial skills are a strength for her. Many measures of memory focus on auditory working memory, so her strength might not even show up on those tests, if it is more specifically visual spatial in nature. Off-hand, the only cognitive battery I can think of that assesses visual-spatial memory is the UNIT, which is a nonverbal instrument not widely used outside of the LEP population. (There are memory-focused instruments that do assess visual-spatial memory, but that's probably more involved than you need to get at this point!)
