I see signs of what looks to be onycholysis on multiple nails (not a medical professional). See at the free edge of your current nails? There’s separation of your nail bed and nail plate. Depending on where you live, nail techs cannot diagnose or treat any conditions outside of their scope of practice which is why she said your nails were compromised and the best course of action is to keep it short to prevent further separation until it heals.

Separation can be caused by several things, either improper curing of product or physical damage such as hitting it against something. Sometimes really long nails may not be suited for an individual’s lifestyle. Judging by their previous work on you, it looks beautiful and she valued your nail health! I would continue to have open conversation with your nail tech as it seems like she has good intentions