Let me preface this with I am NOT in PA, and I know many people on this site are, so hopefully they will chime in with any relevant PA specifics.
In general, paraprofessional can absolutely provide academic supports, which includes instructional support (with some exceptions, maybe, for specialized instruction which requires training, such as reading instruction in Orton-Gillingham). The supports you have indicated in your post seem to be very reasonable accommodations that a para can provide. I believe school districts do have the right to designate which staff members will provide which accommodations, but if the person they designate (are they saying the gen ed teacher should be doing this?) is unable to do so or unable to do so in a timely manner in order for the accommodation to be effective, that might be a better argument. (Stated, of course, in a way that does not criticize the gen ed teacher in any way - it is often the case that gen ed teachers simply don't have the time to make sure all accommodations in all IEP's are addressed. Which is one of the very reasons for a 1:1!)
I would ask for an IEP meeting to discuss the practical implications of what they are implementing - your child is not getting chunking and modeling in a way (or at all?) to allow her to process information and participate in the gen ed classroom with her peers (depending on how confrontation you want to get, you could throw in words like "denial of FAPE" and "discrimination based on disability" and "failure to follow the IEP document/accommodations"). Instead of taking on the burden of proof yourself for why a para can do these thing, turn it back on the team and ask "why can't she? Where does it say this in federal or state law/guidelines?" But I agree that it would be helpful to come armed with something specific from PA, so hopefully others will respond to this post.