Tanya Watts made the statement through Avon and Somerset Police earlier this evening.
Becky, 16, who lived with her dad and stepmother, went missing on 19 February. Her body parts were discovered at a house in Barton Hill on 2 March.
Tanya, 46, said: "I would like to say a big thank you to everyone who took my beautiful angel into their hearts.
“I have felt unable to say anything about Becky until now as the sense of loss and pain is overwhelming. But throughout this time I have been so touched and comforted by how people, many of whom are complete strangers, have taken the time to express their condolences.
“I feel Becky's presence all around me. I know that she is up in heaven with her Nanny and Grampy and other people that loved her.”
In her touching speech, Tanya thanked the public for the support, adding:
“Thank you to all those people who helped search for Becky and get our angel returned to us. We were able to see each other one last time: I know that she is at peace and can now have the dignity that she deserves.
“I am determined to focus on happy memories of Becky as a beautiful baby and gorgeous girl. I have been going through old photographs and she has a beaming smile in all of them.
“This is how she should be remembered - for her beauty inside and out.”course of justice.
Karl Demetrius, 29, Donovan Demetrius, 29, Jaydene Parsons, 23, and James Ireland, 23, have been charged with assisting an offender.
It’s believed forensic examinations to determine the circumstances surrounding Becky’s death will continue for several weeks.
So far, over £10,000 has been raised to help towards the funeral costs.