Bobbi will be buried in Westfield, New Jersey with her late mother.
A source exclusively tells RadarOnline: "Whitney's headstone now has a circular brick border garden, and two rosary necklaces have been added. A new sign spelling out 'Love' has also been placed to the back left of the stone".
A source tells the site: "The graves around Whitney are occupied. Bobbi Kristina's remains could be placed atop Whitney's coffin, with mother and daughter together into eternity".
Bobbi, 21, has been on life support and fighting for her life since January 31, 2015 when she was found face-down in the bathtub unresponsive by her husband, Nick Gordon, in the bathroom of their home in Roswell, Georgia.
She was only just last week moved into a hospice where she would reportedly live out her last days.