I think Meloni is an ambitious fascist, but that she might be more ambitious than fascist.
The issue with an ambitious fascist playing the electoral game and coming to power is that they will most likely choose to implement fascistoid policies whenever an opportunity will present itself that does not compromise their power.
But the good or at least better news is that an ambitious fascist might not feel inclined to weaken the institutions of the parliamentary system that put them in power.
Another element is that IMO Giorgia Meloni would end up quite low comparatively were we to rank far-right Italian figureheads on scales of anti-parliamentarism or autocratic tendencies.
That might be explained by the misogyny of her electoral base: neo-fascist and far-right Italians who despise parliamentary politics might agree to tactically designate a far right woman at the head of their government or their parliamentary group as long as they are within the parliamentary system, but most of them would never agree to put a woman into power in an autocracy, even as a secondary figure.
I think Meloni understands that, and that she has relatively low autocratic tendencies because she knows those ultimately clash with her personal ambitions. She could most likely never be as important as she is now in an authoritarian, reactionary regime.
English is not my first language, so if I wrote things weirdly, that's why.