Constant crusing and nose rubbing ?

My 6 month hypo burm keeps on rubbing and cruising around her tank constantly . she hasn't got mites her warm side is 90-92 and ambient 78-80 I fed her 2 days ago ,she gets fed every 7 days does anyone know what this might be I have other burms and never experienced it to this extent little bits here and there but she is crazy with it, I know this is abit of a newbie question but in the 11 years of keeping reps never had this problem .apart from breeders and it is frustrating

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