Super told me there is extra 2 people lives on the apartment

[Tina Lee]

Hi all, I have this apartment on new jersey, where I rented to one girl only, recently she claim she lost her key and ask me and super for extra set of front door keys, also since I am the one who pays sewerage/water bill, i notice the bill almost doubled on this quarter. so i called super, super mention to me on the phone there is 2 extra people lives on the apartment as well as he got complaints of marijuana smell from the apartment. I have mention to her on text ask about water Bill she never respond back, and she also pays rent late almost every month for past 3 month ( I had to ask her to reply to me text otherwise I will started eviction this month then she went ahead zelle me the rent) last 2 month the rent payment is coming from different number that I don't reconize (zelle to my account)

her lease ends may 30th, i don't plan to renew her lease, specially with her lock of response. 

now my questions is new jersey has this law i can't non renewal the lease unless reason is giving. so i know from the super that there is extra two people lives on the apartment and i have double water bill that i had to pay, so how can i prove that she have extra 2 people lives there , if i sent notice and take her to court do i need to prove of anything? (super just told me over the phone when he visit her apartment he smells marijuana and say extra two people lives there verbally)

whats the best aproach for me to end lease with her.

thanks