in vs at

[Untaught]

My respected teachers

(It's me 'twilit'.I had to change my username for some reasons.)

(1)
"She asked me whether I loved her or not.I said in reply that I don't want to tell you OR I didn't want to tell you." Which one is correct?

(2)
I'm in school now.
I was at school when you phoned me this morning.
I'm in a meeting now.
I was in meeting when you phoned me this morning.
I'm in a party now.
I was in a pary when you phoned me this mornign.
If we are present.We have to use ''in'' and if not then ''at'', right?

Thank you!

[Mister Micawber]

(1)
She asked me whether I loved her or not.I said in reply that I didn't want to tell her.

(2)
I'm in/at school now.
I was in/at school when you phoned me this morning.
I'm in/at a meeting now.
I was in/at a meeting when you phoned me this morning.
I'm at a party now.
I was at a party when you phoned me this morning.
If we are present, we have to use ''in'' and if not then ''at'', right?-- No, that is necessarily irrelevant.

Please check your writing before you post. I shouldn't have to spend time correcting your typing errors.
_________________
Native English teacher at Mister Micawber's

[Untaught]

Thank you very much!