The end result does not have a warm, sunset effect. You may have had your camera set to automatic color balance. If so, this could have caused the warm colors to nuetralize, reducing the warmth and also causing more blue in the rim light. Rim lights tend to look a bit blue on skin, even when the light sources are the same color.
The reflector was at a low angle, which could have been more flattering if her face was angled down, or if the reflector was brought higher. Turning her face towards the reflector would bring more light on her right eye. The rim light shinning on her nose is distracting. Turning her head away from the rim light, or moving the rim light more behind her would solve that.
I recommend when you bounce your flash, try the white side of a reflector for a softer, more natural light. If you want to warm it up, add an orange CTO gel over the flash, and set your white balance to shade, flash, sunlight, or cloudy setting.
Your subject does seperate well from the background, when there is enough brighness behind her, but her hair blends into the dark background. You could clone some blurred tree leaves in behind her hair.