well, sis is doing the right thing, taking a course, trying some out, both wheelies and pistols, and probably shouldn't be jumping to conclusions re: Beretta vs. Glock, there being hundreds of choices available in handguns
at this point, suggesting brand X vs brand Z seems awfully premature
I think better advice offered would be non-make/model specific, and not even caliber specific, but more generically along the lines of what differences there are in type of guns she could try to get a feel for
what size & weight is most likely to imply re: "shootability" within any chosen power range
various basic safety features, as vary within the basic types of handguns (revolvers & autoloaders)
single stack vs double stack
triggers - SA and DA and DAO and hammerless and striker fired
list a few of the "most common" candidate handgun calibers as objectively as possible 32acp, 380acp, 9mm, 40 S&W, 45 acp... 32 mag, 327 mag, 38/357... (but 44 mag or 454 casull could probably be left off the list at this early stage), with minimal "bullet points" explanation as to what expected differences are (recoil vs power)
not a simple task, to do that whilst keeping it brief, but unless she already knows all that, those are things she should be at least aware of when considering what guns to give a 1st person try
after she tries some, the conversation can then shift to make/model
biggest problem with this oft repeated question ?
the notion that she might later consider CCW
because all CCW choices involve compromise criteria which make the choices even tougher to sort out
if you happen to agree with that statement, then consider suggesting she forego the CCW criteria, and just focus on getting a handgun that fits her well, that she feels comfortable with, and can practice with to develop shooting skils
one shoe does not fit everyone, nor is any one handgun "best" for all purposes.. but we all essentially have to start somewhere, with "just" one
After all, how many folks do you know who CCW and actually own ONE and only ONE handgun ?
larger than "CCW size" is usually easier to 1st learn and develop skills with, and teaches shooter a lot more about what they might best pick next for their CCW