Forget FT. High mag maybe OK to assist in range finding but to get a scope you can ACTUALLY trust to give you a consistent reading, you HAVE to spend the money. THERE IS NO ALTERNATIVE.
The other issue, is the higher the mag, the more sensitive to alignment and movement it becomes. A lot of FT shooters will crank it up to range but pull it back for the shot. You do not need to see "made in China" on the kill paddle. High mag is NOT your friend unless you really practice and can plough through the frustrations.
If you want a bit more umph, go bench. by podding the front and bagging the butt, sorting the height and body position etc., you are giving them both the potential to whack what they are aiming at.
Keep the ranges sensible. if you want to test them get a reducer BUT keep it close until they are regularly dropping it. Then and only then can you push it out a bit further. If you over push it, they will not enjoy. Its a walk not a race.
Also, know when to take a break or indeed, when to stop shooting for the day. Always walk away on a positive feeling. If they walk away frustrated, it will just fester.
You primary issue is that the perception for a scope is very individual. You give 10 shooters a scope and you will get 12 opinions back. My mate shoots a Bushnell elite 1200 (I think that is right) but I don't think its nothing better than a bit of drainpipe.
I would look at a better image EVERY TIME and a ret that works for them - especially your lass. She will have the least ability to adapt so reverse the approach and find a scope that works for her and you compromise.
For clarity, I thought the Optisan EVX range gave very good image quality. MTC too - speak to GaryC on here. he is a miserable ol bugga but under that crusty old hide is a decent and knowledgeable guy. Tell him I recommended you and it might lessen the swearing
You will be in a dilemma re buying 2nd hand or new. both have relative advantages but 2nd hand the least options if it isn't right.
Also consider a club - most members are usually more than happy to let you try and will give feedback re what hot and what's not plus possibly a richer environment and they can compete with peers.
Bench it, don't worry about weight. you can start messing with their heads re range finding later.
I would also look at HFT - you don't need high mag - it does you no favours. A good image and the right reticule for your eyes is far more important and the other shooters you will be with are always willing to help and offer advice. Mostly good but you will need to sift the knowledge from the wannabes.
In a battle of wits I refuse to engage with an unarmed person.
To one shot one kill, you need to seek the S. Kill only comes from Skill