Alaikumassalam wa rahmatullah,
Arabic names can be spelled in any way the parents desire. For example the name Muhammad is written in a dozen or so different ways, and this does not change the meaning. Therefore you can spell Taaliah however you wish, for example Taliah, Talya, Taliyah, Talea, Taleia, etc.
The same applies to Leia/Liya, you may spell it the way you like.