You are not overlooking anything and your questions are valid. Here in NC for longbows and recurves it is 40# and for compounds it is 35#. Go figure. The bows must be marked those weights. Nothing in the reg states xx @ 28".
Here is the wording:
Archery
l Archery hunting is limited to longbows and recurved bows having a minimum pull of 40 pounds, compound bows with a minimum pull of 35 pounds and crossbows with a minimum draw weight of 100 pounds. Only arrows with a fixed minimum broadhead
width of 7/8 inch or a mechanically opening broadhead with a minimum width of 7/8 inch in the open position may be used for taking bear, deer or wild turkey. Blunt-type arrowheads may be used in taking small animals and birds, including but not limited to, rabbits, squirrels, quail, grouse, pheasants. Poisonous, drugged, barbed or explosive arrowheads may not be used for taking any game. Bolts must use broadheads as described for arrows.
Nowhere does it state the trad folks can hunt rabbit or squirrel with anything less than a 40lb longbow or recurve. The wildlife commission(ers) feel they do us hunters a great service. Here in NC they like to write legislation to confuse folks. Vagueness is sometimes too rampant in the regs. The legalese is all too obvious.
And there are folks who have bows made and have 40@28 written on the bow even though it may be pulling considerably less. 35 is plenty to kill a deer, as long as the shooter is actually pulling back to 35lbs of thrust onto the arrow.
As for your wife, if she is pulling to 24" on a 40@28 bow, then she might be pulling as low as 30-32lbs on that bow. That light is getting too close to too light.