Guess it's worth updating this discussion somewhat given Graveyard Shift's numerous changes.
If I recall correctly, in a previous patch she used to give 2 stacks of Regeneration when any fighter was defeated, which was neat and they would stack up to 4 if done consecutively.
Now she gives Heavy Regen, which in turn means that it can no longer stack like before, but the trade-off is that she can inflict Curse and Heal Block while having any Regen stack. Now not only are both useful to take on multiple threats, but its restriction is easy to overcome.
Just like with Mortuary Drop, use a Chocoglycemia and you'll already be able to debuff the opponent. Kudos if you can use a Mortuary Drop and inflict Stun, Curse and Heal Block at the same time.
However, while she has these major improvements that make her far superior compared to the bronze Vals, I wouldn't go for her myself. Her HP stats are decent, for sure, but she lacks attack power. In terms of healing, Last Hope and Surgeon General do a much better job, and while the restriction for Curse and Heal Block is easy to bypass, it's nontheless a restriction, so I consider characters like Purrfect Dark superior.