Help!!! My mrs has noticed on some leaves some ora...

As you are near to harvest it shouldn´t bother you too much. Could be a ph-problem but that often happens when growing soilless. After week 6 of flowering growers usually lower their EC down to 0.4 for the last 2 weeks before harvest to flush the plants. So even it is a calcium, phosphorus or ph-problem, you cant reaaly do anything at this point but take care of flushing.

Looks like a calcium problem. The burnt tips look like nutrient burn. The spots definitely looks like a calcium deficiency though.

pH Fluctuations PH fluctuations can cause brown spots on middle or lower leaves Quick Summary: Managing pH is crucial for cannabis plants to be able to take up nutrients through their roots. When the pH around the roots jumps up and down, it can stress the plant and cause brown spots to appear on the leaves. Spotting on the leaves as a results of pH fluctuations is more common in hydroponic setups (where the pH tends to go up and down), but it is possible it can also happen in soil. This seems to often happen when the pH swings too high or low. Note: You can also get these symptoms from root problems or root rot! Problem: Certain leaves on the middle or lower parts of the plant show tan or brown spotting. Tan spots on cannabis leaves - caused by pH being off This can Solution: The main way to fix this problem is to fix the pH problem that caused the spotting (more info below). The leaves that are effected will not recover, but once you fix the issue, the problem should stop spreading to other leaves.

Twisted tips, random necrosis spots , its definitely a Calcium deficiency. Increasing Cal/Mag agent at the end of its life cycle will be useless as it needs Mag/Sulfur at this stage.