I would love to know any information about Burnetheart that you want to share! I love her design and the little we know about her from the quote & blurb. Am I allowed to headcanon her as a distant ancestor of Dawnshine, Goldenheart, and Flametail?
Sure go for it! You could even argue that “canonically” to the rewrite she is their distant ancestor through Tawnypelt since Burnet’s descendants are Thunderhearts.
As far as other information on Burnetheart goes:
1. She met Lichenshade when they were both on a roam. Many shires do large-scale roams together, and in this case the Shadoweyes and Thunderhearts did a joint one. They had a brief fling that ended very badly and resulted in Silverblaze.
2. Burnetheart was the only daughter of Amberclaw, whose brother was the Thunderheart thegn, Redstripe (Redstar from Cloudstar’s Journey). Redstripe had no kits of his own, so Burnetheart was the closest he had. She was pampered by her father and uncle and has a bit of a pompous, self-absorbed attitude as a result.
3. Burnetheart is also obsessed with legacy. She was willing to entertain being mates with Lichenshade in part because he was the son of a once-powerful thegn. Her fixation on legacy and power resulted in her pressuring and living vicariously through her daughter. Silverblaze grew up with her mother always right over her shoulder, driving away friends she thought weren’t good enough and removing any distractions between her daughter and thegnship. Burnet and Silver do not have a stable parent-kit relationship.