The other ai seems very sinister though, whatwith how she seems to constantly be passively brainwashing people into seeing him favourably, depend on him, and so on. Dunno if sheryl is immune because of personal disposition (possibly biological like mc and katsuya, or simply intellect/emotional state), or if it is because of the deal with alpha of minimizing interference (maybe she is even inversely affected, to make her keep akira's tools from changing their mc). But the way she seems to consider sheryl a threat due to her effect on katsuya seems to indicate it is her own resistance, as the inability to control her would make her even more of a threat to the ai's well-constructed plans.