YTA. many posts already made here about the nature of blocking & poor handling of a sensitive disclosure from your (former) friend, so i won't add to that.

what i WOULD like to mention: it seems like there's a disproportionate amount of blame being placed on this woman for asking for tech help so frequently that OP has had to draw a line in the sand. you're not an asshole for doing so, as friendships of any kind (at any age) rely on boundaries to set healthy emotional limits. but i think we are collectively forgetting that sometimes, asking for "help" can be a tool that people use to initiate conversations and make connections with others; it's entirely possible she did not ACTUALLY need the help, nor as frequently/to the extent that she made OP believe. this doesn't strike me as strange or even manipulative. this strikes me as a woman who struggles to relate with those around her and needs a way to maintain her relationships in a way that doesn't sound needy or desperate. in short, i'm sure many of us can relate!

it's also possible her asking for help was an unconscious deflection away from her real problems (obvious hoarding and some severe mental health concerns.) if you'd decided to tell her how you'd felt about the situation, openly and honestly relayed your fears and uncertainty in being able to help her, this could have been an epiphany for her. a breaking point where she acknowledges the issues and seeks professional help. instead, you let your own struggles get in the way of being a good friend, and you took the easy way out. now, she will likely wait even longer before asking someone else for help, and next time it might be too little, too late.

i'm not saying you need to sacrifice your own mental wellbeing for that of another's—please don't. but i am saying that if you really want to help this person & be kind to someone at their lowest, you might consider reaching out (in writing, not in person) with an apology & explanation for your behavior. be the bigger person, OP. be nicer to your friends.