5B is probably VAkiha's strongest option in blockstrings. It moves her forward, can be partial charged, and if it happens to connect on a croucher, it gives knockdown. When at close range, use 5A/2A/5B to make them sit still. After that, you can start staggering the 5B to try and catch mashing/jump outs, and/or start working 5C/4C/2C into your blockstring. (These normals will push VAkiha further away, but also attack from a much further distance.) The trick here is to keep in a range where you can poke with any normal (5B/4C/2C/5C) and if it happens to connect, you are still able to confirm into full combo. (Momiji loop) Most of V Akiha's normals are normal cancellable very late in the animation, so you can easily make deceiving staggers.
If you're still playing MBAC, you have the wonderful resource that is 2368A. Once you get the defender to sit still with your scary staggers and pokes, you can start resetting the pressure situation by using the TK flametongue, which has frame advantage on block.