Tiffany continued to say that her mother was "very connected to her fans" and that "it comforts the family to know just how loved she was".
Jackie sadly lose her battle with breast cancer on September at the age of 77, after dealing with the disease privately for six-and-a-half years.
Just over a month after her tragic death, Jackie's daughters Tiffany Sachs, 48, and Rory Green, 46, attended the Big Brothers Big Sisters Big Bash in Los Angeles, where Jackie was honoured with the Pioneer Award by comedian Kathy Griffin.
Rory led the heartbreaking messages, admitting that the girls were still struggling to come to terms with their loss.
She explained: "This is our first foray out of the house, we have been in sweats and t-shirts for five weeks crying, it is surreal."
She continued: "To be in this position where she is being honoured and we can accept the award on her behalf is very special, we definitely feel her with us."
Tiffany then added, according to BT: "It's very bittersweet, she was such a pioneer and she was so incredible, and the outpouring of love and support we have received since she's gone is unbelievable.
"It's so heart-warming to us and makes us feel so good to know how loved she was by everybody.
"She would be so honoured, we are just sad she can't be here to see it but we know she will always be with us."
Jackie's best-selling novels included Hollywood Wives, Chances, Lucky and Hollywood Husbands.
The girls' appearance comes after Jackie's final letter was recently published to mark Breast Cancer Awareness month.
She opened up about her own diagnosis and urged others to stay positive and live life to the full.
The author wrote: "Cancer does not have to be a death sentence! You, or someone you love, can live an extraordinary life regardless.
"Be kind and be grateful. Never underestimate the power of your mind.
"Embrace what you love, and LIVE life to the fullest, as tomorrow is not promised to any of us.
"Whatever your pain or struggle in life, don't allow it to turn you into a victim… let your battle turn you into someone else's hero!"