Reimu's dialogue in panel 3 could also be "W-well, yeah, but not that much!!" So the initial translation is just fine.
W-well yes, but not really!!Were you lonely?As always, Reimu's such a tsundere.Why are you so happy about that!?You're weird!!No...! I was wondering if you'd gotten sick or something...You worried about me, huh.What are you doing, after not even sending any letters for so long!?☆ It's been a while! ☆Ma...!?Reimu! It's been a while!