Ultimate Muscle – Blythe has no size limit, suggesting she in turn never runs out of tissue mass, one can logically infer this means she can regenerate almost limitlessly. This also allows her to increase her strength –without limit- Verdict: Possible limitless regeneration and limitless strength, both god-like abilities, T9/10

Phenomenal Cosmic Power: Blythe has limitless endurance and immunity to diseases (and afflictions, whatever that means, presumably another form of blanket immunity.) Blanket immunity is banned in Arena (except in very special circumstances where immunity is granted by logic alone, such as a robot having no blood and therefore being immune to poisons.) Verdict: Limitless Endurance, Blanket Immunities, both godlike abilities in this context T9/10

Dem Bones: Blythe has ‘nigh unbreakable’ (so what, nearly invulnerable bones she can also protrude from her body as weapons or defences?) bones and more blanket immunities. Verdict: Super bone armour and weapons, nigh unbreakable wording is ambiguous, T9 powers.

Melty Blood: Super flexible blood, instant regeneration powers by consuming other blood, immunity to disease, poison and exsanguination. Verdict, T8, just on the cusp.

Outrage: Psionic defence (because Blythe obviously needs to cut off another entire method of attacking her other than physical force.) Vague notions of speed and strength being equivalent, no statistical limitations in sight. Super-dashes with no implications of having a cooldown, so essentially the ability to move faster than the human eye can see albeit in a jerky fashion. More strength without limit. Verdict: Potentially looking at Mach speed, who knows. Strength is limitless again. Some vague stuff about super shockwaves, who the hell knows any more. Verdict: T9, potentially T10, as any limitless ability is by necessity godlike. 

At the moment, there's a serious issue with scope in some of the wording in Blythe's power-set. For example, you said that she can actually only run at about 100mph, but no-where does the sheet suggest that. There is also no particularly reason why she can't just use her dash ability constantly to maintain insane speed, because you don't mention any limitations. It's things like this that are causing issues for LeeRoy in judging if your character is fit for this setting. (For the record, T8 is the highest character tier level allowed in this setting, anything over that is just too powerful.)