The schoolgirl found dead along with her entire family hosted a sleepover with her school pals to celebrate her 11th birthday just days before her death.
The bodies of 11-year-old Maja Wlodarczyk, her dad Michal, 39, mum Monika, 35, and brother Dawid, three, were discovered at their flat in west London on Friday.
Her friends today paid tribute to "beautiful" Maja as it emerged she hosted them less than two weeks before her life ended.
They continue to lay flowers in front of the house where many stayed the night on May 31.
Detectives said they were not seeking any other suspects in connection with the deaths but were keeping an "open mind".
Her Southville Primary School classmate Sarah Gouveia, 11, said the group played Just Dance and badminton in the garden with Mr and Mrs Wlodarczyk.
She also said that when she came back from trips to Poland, Maja would always bring back sweets and lollipops for her friends.
Sarah revealed they would also play sports, including football, regularly together and Maja enjoyed being a goalkeeper.
Sarah added: “She was really nice, she would always buy us stuff from the shops.
“We done Just Dance, we played in the garden.”
Another school pal added: “She was really kind and nice, she was helpful with stuff. She was really beautiful.
“Every time she would go on holiday she would bring us something back.”
Sarah's mum Maria Gouveia said the parents seemed "lovely" and worked hard while Maja was a "beautiful" girl.
She said: “We just knew the parents from school, they seemed lovely though. Really nice, hardworking people. Nice, kind.
“Maja was a lovely girl, she was so smart. Beautiful girl, strong-minded.
“I still can’t believe it to be honest with you, it seems unreal, terrible.”
Sarah left a note for each member of the Wlodarczyk family beside some cuddly toys.
Maja’s was addressed “to a beautiful angel” and read: “Dear Maja, I never knew you would be gone so soon.
“Who would’ve known such an intelligent beautiful loving girl would have already been gone.
“I just want you to know that you will never be forgotten you will always be with us in our hearts.”
Dawid’s read: “Dear Dawid, Maja if you wouldn’t mind please read this to him.
“Hi Dawid I never knew I never knew [sic] that I wouldn’t be able to see you again. I’m going to miss the times I would visit and you would always run up to me and give me a big hug.”
To dad Michal, she wrote: “You were a really nice person you won’t be forgotten.”
And to Monika she put: “Dear Monika you were such a kind loving soul. I hope you know you will never be forgotten.”
Anyone with information that may assist the investigation is asked to call 101, quoting reference 5135/16Jun. Alternatively please provide information via the online form at: https://mipp.police.uk/operation/01MPS23V28-PO1.
