It's understandable that you might have that thought! The show's ending, while not explicitly a suicide, was ambiguous and left many fans wondering about Sam's fate.
However, Jennette McCurdy is alive and well. She has spoken about her departure from acting and her personal struggles since leaving the show, but there is no evidence to suggest she harmed herself.
It's important to be careful about spreading misinformation, especially when it comes to sensitive topics like suicide.