Definitely you got her for that price because she is half TB.
What are you planning on using her for?
They don't show much walk, which is unfortunate as you basically get what they are born with. If you are planning on doing dressage with her - the walk is absolutely one of the most important gaits. It looks to be clean however.
The trot is nice with an active hindleg and swinging shoulder, however it is lacking some power.
The canter could be more uphill and is showing the same swingy-ness as is in the trot.
Overall she gives a very swingy impression with a large stride and active hindleg. The neck is short for my liking. Her best gait is by far the trot, the walk is her second best gait and the gait which is lacking is the canter.
From what I see, she will make a nice low/medium level hunter and could do second level dressage with consistent scores.
Your difficulties in dressage will be collecting her as the neck is short, the stride is large and she wants to swing along the ground instead of pushing off and creating power with her hindlegs.
They say money doesn't buy happiness -- well happiness doesn't buy horses!