Straight up, two things that Blythe does not have ready-made answers two in combat:
1) long range engagements, as she is entirely one dimensional in that aspect, possessing only shockwaves and bloody webs with which to reach opponents beyond her fingertips
2) actual super-speed, as she does not possess it

Past that, as I mentioned previously, beyond Blythe's baseline (which I will gladly halve or even take a zero off of if it makes everyone feel better), her strength (and durability) rises to match her opponent; while Blythe [b]can[/b] increase her strength beyond Vorsours' equalizing power, she would need regular, [i]constantly-applied force[/i] and exercise to do so, same as a regular person.

Like Enki said, if you don't want to deal with a constantly escalating Blythe, don't try to beat her with pure strength.