As in, she is smashing it on my head?
Yes pretty much, could be on any other part of the body too :)
זֶה בְסֵדֶר, אֲנִי סְפִינָה.
hi shovéret aláy et ha-bakbúk.
If she hits me in the head with a bottle, my head would break not the bottle!
איזו בחורה נחמדה!
כן, יש לי גם אחות...
עליי both at the middle and end of the sentence?
I wonder why את הבקבוק if the action is performed on me and not on the bottle
Because the bottle is being broken, not me. You have to take into consideration the meaning of the verb. "me" would be the object if the sentence were something like "she is beating me with a bottle". היא מכה אותי עם בקבוק. "hi maka oti im bakbuk".