At that age, there might be a big difference in the programs. Considering that she is six, she would probably either be placed on a mini full year team or the prep team. In my experience a lot of prep teams encompass a broader spectrum of ages, meaning she might be put on a team that has kids up to 11 (youth) or 14 (junior) . Choreo is faster and less time might be spent on the basics (depending on the coach). You could potentially have another 13+ years in the sport, so I would look at a potential mini program first and see if it works better for you. My daughter started around that age and I am thankful that she was with kids her own age.
(Also, many mini programs do an abbreviated schedule and price structure compared to their older counterparts. Travel is sometimes less -and they might follow the prep teams and do more one day comps.)
I would look closely at what the gym has to offer.