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what is she for him?

I'm stuck.

• ASCII message with correct punctuation suggests some kind of early character based encryption (not full binary encryption).
• Blaise search pops up two famous people - Pascal and Vigenère.
• Vigenere is known for Vigenere cipher, but that does not quite match because he is not the real author of this cipher and his wife was Marie Vare not Marie Ann.
• Marie Ann (as a person) search returns only a lot of social profiles noise, nothing famous or characteristic.

Following Vigenere cipher clue anyway:

• There is very characteristic jcp'zs, in English there are very few apostrophed sequences that matches: we're, you're, she'll, you've. That allows to reverse engineer possible part of the key (Raku code):

sub find-offset( $from, $to ) {

    my $offset = $to.ord - $from.ord;
    $offset += 26 if $offset < 0;

    return ('a'..'z')[ $offset ];
}

for 'youve'.comb Z 'jcpzs'.comb -> ( $from, $to ) {
    say find-offset( $from, $to );
}

which gives most probably phrase loveo.

• Using hint within these pages, the answer is by letter numbers it appears phrase The answer is is literally directly before quoted text, and that allows to reverse more key giving ingloveof. Which kind of confirms loveo.

And now I'm out of ideas :) I can try to brute force check all 15 letter words for first word in encrypted message to see if they give reasonable part of the key but that kind of looks ugly and I have a feeling I missed some important reference here.