Fantasy is Magic

It's always assume that at the very least Sansa will i) out smart Petyr Bealish, ii) regain autonomy and her identity, that iii) in some way or form Petyr's tale will become true such as Sansa securing herself a marriage with Harrold Hardyng and her having such a strong influence on him that he will a) wage war for her 'birthright' or b) aid the North by providing goods, food and manpower. With the Vale enthusiastically doing his every bidding, simply because she is his wife and she asked him nicely/is so courteous and eloquent/he is so inlove with her/its profitable for the Vale.