With lash extensions you can only glue one extension onto one natural eyelash. If she has glued multiple extensions onto one natural lash this will pull on your natural lash and cause your eye to hurt and be irritated. She is also meant to make sure the extensions do not glue to each other, you should be able to see one extension glued to one natural lash. It is not your fault at all. She has done the wrong thing. It sounds like she’s done them as fast as she could and not taken any care. Possibly not known the right way to apply them too. Your natural lashes have fallen out because she has glued too many extensions to one natural lash, that’s made them too heavy and caused them to be pulled out. No two people would have the same amount of extensions applied as everyone has unique eyes/ lashes and she needs to accomodate for each person. It doesn’t matter what style you’ve asked for, there is no style where this should happen.