Now Annie was in bed, groaning theatrically- she's a drama major - but I told my mother I'd go anyway. I hadn't seen my grandmother since she'd been admitted to Lawnrest.
"she's been admitted"
"Annie was bed"
"I hadn't seen my grandmother"
"she's a drama major"
"I hadn't seen my grandmother" refers to the fact that the narrator had not seen their grandmother.
"Annie was in bed" suggests that Annie, who is mentioned earlier, is currently lying in bed.
"She's a drama major" implies that Annie is studying or has a major in drama, indicating her theatrical behavior.
Step 1: Annie was in bed, groaning theatrically- she's a drama major.
Step 2: I told my mother I'd go anyway.
Step 3: I hadn't seen my grandmother.
Step 4: My grandmother had been admitted to Lawnrest.