history: I left my old job to better myself and I have my old supervisor to thank for that and for influencing me to branch out.  I got a new job and it is so great and I have my old supervisor to thank she's the best.
current: Why you need to thank her? Is she the one that helped you to find the new job?
next: She was a great influence and gave me words of encouragement to branch out and go for more then our company job.