Plants generate roots as a stress response and a survival mechanism to seek out water and nutrients. When a cutting is placed in a rooting environment, it relies on hormonal signals rather than external nutrition to initiate this growth.
Need to give her an empty medium, nitrogen signals the plant to prioritize vegetative top growth. What we need is nutrient starvation of primarily N, which initiates root growth to search for richer pastures further afield. On top of that, a cutting has no root hairs to regulate salt intake. If the rooting medium contains a high concentration of dissolved salts, the osmotic pressure reverses. Instead of the cutting absorbing moisture, the salty medium draws water out of the vulnerable cut stem, dehydrating the tissue and causing dieback. The medium must be empty, physically supportive, and structurally capable of holding moisture without drowning the tissue; this would be achieved through having a good, diverse, and porous soil composition.
Done monsters once, I was also very surprised by how long it took to get back into full veg swing. It really depends on how far into flower you take the cuttings, which will determine how long it takes to convert back hormonally. When I took cuttings 1 or 2 weeks into flower, they rebounded fairly fast, but the ones taken 3-4 weeks into flower took much longer to get going again, this removed any "saving time" benefits of taking the cutting in the first place. The 4 weeks waiting for it to re-establish is 4 weeks during which a decent new seed could have gone strong in the same time frame. If time is not an issue, it's worth trying. Best of luck.