Most would make sure their signature on legal documents is neater than usual. Most wouldn’t use a name they aren’t known by. When all the letters are relatively legible, most don’t obviously leave out a letter in the middle of the name. Blasey/Blasy seems more like someone didn’t realize it contained an E and was going by the pronunciation. Sort of like that oopsie with the 4 boys but one turning out later to be a girl with a boy’s name. That’s a mistake a third party would make.
Maybe so, but your legal signature is just how you always sign your name. We don’t have any other documents she has signed to compare.
Everyone always told me I s/h been a doctor when they see my signature, since they’re notorious for bad handwriting.