Is Christina Aguilar still an active T-pop singer ? What is the last song that she released ?

She's basically retired. I loved her so much back in the 90's. Her first three albums forever changed Thai pop music scene for female pop artists.

She's 56 years old now and hasn't release her own self album since 2007 (C.Space album) and some special project albums with other Grammy artists in 2009. She does performances and concerts together with other Grammy artists from time to time but that's about it.

คริสติน่า อากีล่าร์ << if you copy that in YT, you'll see her MVs posted to Grammy YT channel.