Is my sis irritating or adorable?

I send an sms to CherylKoh in the afternoon
" What you want for your birthday?"
After 5 mins, she replied "1 year supply of contact lens. MUAHAHAHAHAHAHHAHAH."
"You wait long long."

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I was sitting on my bed, just opposite the computer table. CherylKoh was on the msn.

Me: "Cheryl, nah." (Puts out $$)
Cheryl turned the chair around with a quite irritated face. Immediately changed expression when her eyes were locked onto the $$. Grinning from ear to ear, "Ni yao gei wo duo yi tian ma?" (Do you wana give me more), smiling wider as she whined.
I shot her a -.- look.