Bilingual/English as a Second Language - Elementary and Secondary Levels
Special Education - Elementary and Secondary Levels
Career and Technical Education - Secondary Level
Technology Applications and Computer Science - Elementary and Secondary Levels
English Language Arts and Reading - Elementary and Secondary Levels
Mathematics - Secondary Level
Science - Secondary Level
These are the TEA teacher shortage areas
What age of students is she most interested in working with?
I know that in some states, teachers are paid more if they are certified in certain areas. If that is an area you are passionate about, it works. I do not know about extra pay for subject areas in TX.
It is generally accepted that if a teacher wants to rise to a higher level of pay, they need to consider becoming an Assistant Principal or Principal. This is a wonderful path for teachers that want to impact the learning of a whole school.
Another path to higher pay is ongoing education resulting in a Masters or higher degree.
Many teachers are passionate about teaching, consider the summer off as priceless and are satisfied with the pay since they are working in the area they love. Some teachers pick up a job teaching summer school.