I would NOT suggest recording her - it's not worth it, will likely cause more harm than good, and there are better ways to deal with this.
Another thing that would be a HUGE help is for your parents to arrange a meeting at the school with ALL of your teachers present, as well as the principal your SE supervisor you, your parents, and an independently hired certified interpreter. The sole purpose of the meeting being to make sure that the teachers are absolutely positively aware of what the interpreter SHOULD be doing (regardless of you YOU are doing). It might also be helpful to call in interpreter agency and ask if they have anyone who can do some sort of "interpreter orientations" at the meeting (even if you have to pay for it yourself - it's worth it AND you'll be helping any Hoh/Deaf students who come after you!!).
Most teachers don't understand the role of an interpreter - they understand the role of a "signing educational assistant" (they sign, they deal with behaviour issues, and basically "get involved" with what the student is or is not doing). An interpreter on the other hand (as we know) is there to interpret the spoken and auditory information in the class into ASL, and then (if needed) voice for the Hoh/Deaf/SI person - they aren't your "buddy" , they aren't you "mother/father", they aren't your "behaviour monitor - they provide ASL/English and English/ASL interpretation. (Outside of class, if you want to be friends, all the power to you... but while she's functioning as your interpreter she's required to be absolutely professional. period.)
I'd really suggest talking to your parents about writing the letter I mentioned previously -but also having a formal meeting with all your teachers etc and a independently hired interpreter so that once and for all the "role of your interpreter" can be made crystal clear to the teachers, the SE supervisor (who could use an unbiased reminder from someone like an interpreter orientation person from an agency - or university Disability Services Program)
The best way to deal with on YOUR end is to be "very professional" - by which I mean politely but firmly state at the beginning of each class that you are requesting that the entire content of the class be interpreted - that she is to continue interpreting if you glance away (because you can see using your peripheral vision). Even if she thinks that you "appear to not be paying attention - or even fallen asleep" SHE is to continue interpreting in a professional manner - just like she would do for an adult student taking a university course.
Repeat this EACH class (yeah, it's going to get annoying) so that she understands CLEARLY what you are requiring of her for each and every class.
If you speak - make sure that you say it in a confident (but not rude) voice ... then if anyone overhears you, they will hear you being direct, confident in what you want, but also polite (which is important).
If you can, it might also be helpful to write this out on the computer, print out 2 copies and have you and your parents sign both copies. That way you can give one to the interpreter if needed, and can keep the other in your bag/backpack/etc to show your teachers etc if they ask any questions (show it to them if asked, but tell them you require it back to hold onto for other teachers etc). That way everyone knows that your parents are in agreement with what you are requesting
I really hope this helps !!