Will the side effect of blurred vision from taxol chemotherapy clear up after infusion has stopped?

You can view side effects of Taxol here: https://www.drugs.com/sfx/taxol-side-effects.html

From the above link ".. Optic nerve and/or visual disturbances (scintillating scotomata) have also been reported, particularly in patients who have received higher doses than those recommended. These effects generally have been reversible. However, rare reports in the literature of abnormal visual evoked potentials in patients have suggested persistent optic nerve damage. "

From the above, your sisters visual problems have been reported. Generally vision is restored. If her vision does not improve it may well be worth checking to see if there has permanent optic nerve damage.