Well.. of course I play with range, turning into the swing, feints behind your back etc and all that, and I can imagine it is a bit intense to defend against.
But technically, I can't outspam any reasonable build shielder. Agi shielders with a fast sword I can just forget about outspamming. Sometimes I'm even surprised how fast I get slashed to the head after they block.
Mala always uses a short sword, so that makes it somewhat easier. Simply stay out of her range. (Not that its easy with her athletics and speed though)