Your non-wordpress application cannot see the WP cookie because the WP session cookie is only set for the path that WP is installed in (/blog in your example).
You can configure WP to create the session cookie for the root path “https://wordpress.stackexchange.com/” so your non-wordpress application can manage it by modifying your wp-config.php, add –
define( 'COOKIEPATH',"https://wordpress.stackexchange.com/");
define( 'SITECOOKIEPATH',"https://wordpress.stackexchange.com/");
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