Ok, let us all look at the hard facts (no pun intended).
1.) Given that the initial hand has 10 cards and you draw 3 cards 2 times we can expect up to 16 turns, meaning 8 times she can buff.
Which means her 8 points are on par with Woodland, Adda and Crach.
2.) While Adda can deal excess damage and thus adding less net points, though more important ones than Woodland, this
card adds 8 x 1 points, while Crach removes 8 x 1 points, which already relies on the assumption that Crach always has
targets.
An opponent can easily play artifacts/immune cards for a few turns to reduce the total value Crach can get and the synergies he can enable.
3.) Synergies: Bloodthirst cards require the target to survive, which means that Crach's damage (in that instance) is not worth
more than an equivalent buff, given that the targets remain on the field, which means that in this case Meve's boost
(triggering boost reliant NR cards) is essentially the same, though you can control if targets for Meve are on the field.
All in all this should make clear why Crach is not straight up better than Meve.
Meve has more reliability and can occasionally add the 1 point needed to move out of Aep Dahy range, Muzzle range, removal range (though this is just a situational bonus, the odds are fairly low (apart from the 11 provision Dragon Saskia I cannot think of any real examples right now)).