Tell her to stop. If not, to prevent her from borrowing your things, I recommend putting them into a different place so she doesn't find them.
I don't have one ,but my friend has a really annoying little sister ,and trust me she is ANNOYING!!!!!!!
it depends on how shes annoying you
On your little annoying sister's birthday.
You can play with them
a brat
Hahahaha I believe all younger siblings can be annoying at some points, but they will always love you.
Just don't talk to her cause I have a little sister
My little sister
Your brother's sister is your sister. Child,kid,kiddo,by name,munchkin,jelly,little sister,annoying brat,sis and others
Answer: Ask her why she is being annoying and ask her to stop. Whatever you do, don't flip because your sister might not be too pleased with you and neither will her best friend if that is the case.
Parents never tell my little sister/brother and her mates off when they are annoying me because parents either feel embarrased to shout at your little sister/brother in front of her friend or that they feel guilty telling off your little sister/brother's friend, what you have to do is tell your parents what your little sister and her friend did and hopefully they will tell your little sister/brother off for doing so, that's what happens when my little sister annoys me
ignore them