Absolutely! And if she can get her left elbow on her knee (sit cross-legged raise the knee if necessary) and a pack under her right armpit, then that will stabilize her entire body.
To approximate the effect of shooting off a bench rest, you have to achieve the same effect - eliminate any moving component in your rifle or your body.
To take it a step further you can use Stony Point bi-pod shooting sticks under the toe of the rifle (near the rear sling swivel_ to stabilize the rifle even more.
One nice feature of this technique is that it is easy to adjust the elevation of the barrel by using your left hand to move the read shooting sticks up or down in scissor fashion.
Try it and see how it affects the size your wobble in the reticle, or shoot a group using both methods. Reducing the size of the wobble obviously equates to increasing the range at which you can make a safe and humane shot.
Taken to an extreme, this can even work standing: Use two sets of African (wooden tri-pod) shooting sticks, one under the fore-end as usual, and the second set of sticks under the toe of the rifle. This effectively makes a kind of bench rest as you can walk away from the rifle and it will stay where it is aimed. With practice, it is possible to reliably hit 8-12" inch steel plates at 300 yards -- standing.
This is effective anywhere that there is tall grass or brush that prohibits from from any other position except standing, and where there are (ideally) 2 people, each person carrying a set of sticks. Would also work with 2 camera tripods, tri-pod Stony Point shooting sticks, etc.
Many of these ideas were developed by US Marine Corps snipers (Semper-Fi!).