Could be a potassium (K) deficiency, your plants especially neet it during the transition from veg to flower N-P-K
Nitrogen, Phosphorus and potassium. For the flowering stage your plants also need Calcium (Ca), Iron (Fe) and Magnesium (Mn)
Look at the deficiency charts online, i find them quite helpful. Once you give her what she needs the new growth should look healthier within the first day's after feeding. Hope that helped! She'll be alright mate 🌿💨