Yes, both Babinski and clonus are not present. As for the gait it is entirely normal in all phases, with even beter than normal muscular strenght - she is a competitive swimmer.
I've advised her she should consult a neurologist and do an Wikipedia reference-linkMRI but for that we'll have to wait a couple of days.
Apart from a tumour what else do you think it could be?
And how could it be concerning the upper spine without any signs from the upper limbs and neck?