Honestly, I'd be wary of the cohoshes, just because their effect on UR risk hasn't been well studied, and the dosage is unreliable and difficult to control due to differing concentrations in the commercial supplements.
What other options does she have? Has she tried repeated membrane sweeps (like one every 3-4 days for a week or two?) Has she talked to her OB about having a non-stress test and only inducing if baby looks like it's having problems? Has she talked to her OB about using a foley bulb to initiate dilation mechanically (works if she's less than 4 cm only)? How about a gentle pitocin induction if everyone agrees that the baby needs to come out?
I recall feeling very wary about having my water broken as a method of induction for my VBAC because I didn't want to be "on the clock", but really, if they're to the point where they're inducing, you are *already* on the clock, and this can be a simple and more natural way to get labor going than some other methods, so it's also something to consider.
IF the doc is completely inflexible about the NST she can always not show up for a scheduled repeat c-section or induction, but I'm betting that she can advocate for a NST if it's before 42 weeks.
...so depending on how far along your friend is, I'd go for (in this order)
1. Repeat membrane sweeps
2. Non-stress test
3. IF baby needs to come out, foley until 4 cm dilated
4. IF not in labor still at that point, rupture membranes
5. IF not in labor still after 24 hours of ruptured membrane, gentle pitocin
Just my opinion. Best of luck to her!