The poster above that listed a $25.00 fee is likely the lowest you're going to find for one on one, and that's actually a bargain. Pre-pandemic and prior to moving out of state, my oldest (TAMU '18) was earning $60 per hour to tutor math through Calc. III, basic and O-Chem, Physics, and Bio. All one on one, and following students' progress through post exams to ensure success.
To put in perspective, many of the folks above have completed college degrees and have a specific knowledge base and skill set even if the BCS area has a larger number of degree seekers/holders. If a high schooler can earn around $10/hour at a fast food restaurant and it costs around $30 to have a lawn mowed--both jobs that require some training and some skill or equipment cost, $50 for a person with a degree that's running about $120,000 is not unreasonable.
To lower cost going with a group setting, pursuing additional help from the college/department itself, or using online resources may be your best bet if $25 is too high.
Blinn has tutoring for students, so your daughter may wish to give that a try. I believe it is free to Blinn enrolled students.
http://www.blinn.edu/tutoring/index.html