Welcome to the HOD Board!

We have done Bigger Hearts (once a few years back with our oldest, and again now with our middle ds), and I can tell you it is a meaty program. I view the Bigger Heart's year as a pretty important one.

Though my older 2 sons were early readers and writers, they needed time to grow into the skills of Bigger Hearts. Though my 7 yo was reading quite advanced books (really could read whatever my oldest ds was reading, and he is 3 years older and an excellent reader too), he needed time to grow into Bigger Hearts. It's hard to imagine doing PHFHG with a just turned 7 yo, but more than that, it's really hard to imagine a just turned 8 yo doing CTC the following year!

Having just done CTC last year, that is fresh in my mind, and whoa - being younger than the target age range in that guide would really be tough.
We did Beyond Little Hearts the year before doing Bigger Hearts, and Beyond is American history as well. We loved Beyond, but we love Bigger Hearts as well - they are 2 totally different treatments of American history. I think the biographical approach of American history in Bigger Hearts is different from just about anything else out there. I bet you and your dc would find it to captivate your attention (and spur on your patriotism) immensely! I think by choosing Bigger Hearts, you'd be meeting both your dc's needs very well, and the extensions are a wonderful challenge for avid advanced readers.

If you get the chance to print off the first week of Bigger Hearts, and read through each of the boxes of plans, I think you will be able to see what a full program it is. Read each box with just your 7 yo in mind, and really take note if she can do what is asked of her in Bigger Hearts.
http://www.heartofdakota.com/pdf/BHFHG-first-week.pdf
Likewise, you could do the same with PHFHG.
http://www.heartofdakota.com/pdf/PHFHG-sample-week.pdf
This previous post may be helpful as you pray through your decision too...
Amount of writing in Bigger vs. PHFHG:
viewtopic.php?f=6&t=3602
If you want to combine them, I do think Bigger Hearts would be a good way to go. HTH as you consider your options!

HOD is such a blessing in our home. Our dc love learning HOD style, and I love teaching it too.

15 years of teaching - and my 8 years with HOD have been by far my favorite - I think you'd enjoy it too!
In Christ,
Julie