Not sure how much (if any) of this is real, but I'll bite.
First off, don't underestimate the costs of college. Top private institutions--especially those that do not offer merit scholarships, or only offer them to a very select few--are going to have a cost of upwards of $240k over four years. This is a massive investment--even if you're making upwards of 200k/year after taxes, this is not a small amount of cash. You also have a few other kids that will be in college in a couple years, and you'll need money for them as well, because if you're making enough to pay for college comfortably for one student, you sure as hell won't be getting need-based financial aid. Don't immediately discount the possibility of getting some money from D1 programs.
Now, onto the other things. First off, make sure that you know what you're into when considering a move to SoCal. The cost of living in your new neighborhood will almost definitely be dramatically higher than the cost of living wherever you are now. While you may seem to have a huge surplus of money in the rural south, there are parts of California where an income of, say, 250K/year after taxes will be upper class, but certainly not inordinately wealthy. It'll be even worse if you're in, say, Beverly Hills or Manhattan Beach.
5:15/10:47 is certainly very solid for a freshman, but your daughter will have to get used to competing--and losing. I know you say that your daughter is getting bored with the lack of competition, but the shift from winning everything to barely scoring is not going to be easy. SoCal dual meets routinely have girls 1600s/3200s go under 5/10:40. Top California invitationals will have girls under 4:50/10:20. A 5:15/10:47 girl will usually be accepted into these invites, but will not be in the fast heats, and would not be winning the slower heats.
You will also have to deal with coaches that do not want parents coaching their athletes. If you end up putting your daughter in a school with a strong distance program, she probably would not be the fastest girl on the team, which is another rough adjustment. It may be very difficult for you to walk the fine line between offering necessary support and trying to coach your child--something that will infuriate many good coaches.
The last thing of note is that 65+ MPW for a freshman is a lot. Generally kids will gradually build up to that, and 5:15/10:47 off 65 mile weeks is not super reassuring. It's great that your daughter's able to grit through that amount of mileage, but be sure to replace shoes regularly and take recovery seriously--stress fractures can and do sideline kids who are putting in major volume at that age. Train carefully--most 4:50/10:20/17:20 girls are not putting in that kind of mileage, or if they are, they are doing it junior or senior year after building up slowly for all of high school.
As a whole, I would not recommend moving to California specifically for the benefit of your daughter's running. California's fantastic, but it would be a major shock for you and your family and to make the choice heavily off of hopes that it helps your daughter's track career strikes me as a very irresponsible decision. Enter your kid in some competitive regional invitationals (or hell, if she gets that 3200 down ten seconds, see if you can get her into Arcadia next year) and she'll have some solid competition.