Thanks, Lourdes!

That helps so much. Keri sounds like a very capable young lady. From your good description, I do think that she sounds like she would do well with RTR. I think it would be hard to beef up PHFHG for her, and I also think that it would not be preparing her for the next year as well, in case at that point you'd want to have her in a higher guide. I think I'd either have her do CTC with extensions, or place her in RTR.
My first inclination would be to place her in RTR and just get the Economy package without Shakespeare. I totally understand Tamara's attachment to BHFHG and PHFHG - our dc have that as well.

But, I think that because of this unique situation, it would be worth selling them to have a dd appropriately placed. Keri would be able to be more independent, and you won't have any sibling rivalry going on.

The CTC Extension costs about $112. RTR's Economy is about $273. If you could sell anything with the online program, if there is anything to sell, and any of BHFHG or PHFHG, I bet you could get to that dollar amount. (You would just know you'll buy BHFHG/PHFHG again someday for the little guy when he's ready (by then they may be reprinted anyway, and you'd probably want the new ones.

)
For science, your dd could do CTC's science. It is independent and your dd's could do that at separate times easily enough. Or if you sell enough stuff, she could maybe do RTR's science Option 1.
They could easily both do Write with the Best from CTC. It is outstanding for a wide range of writers - it was one of our favorite things we did last year.
I wouldn't do extensions, as RTR is a full program already, and Keri is kind of on the bubble there. With her possible dyslexia, I just don't think it's necessary to do extensions. For Storytime, you can have her listen in on CTC's or just not do it.
It sounds like you have grammar, math, DITHOR, and Beautiful Girlhood already, so that would be great. You could really do either CTC with extensions for Keri, or RTR Economy. RTR Economy, along with the resources you already have, will let you do everything in the guide except the Science box, the Medieval History Based Writing Lessons, Storytime, optional Shakespeare, and optional Phil. music CD.
HTH - but you will know best! Praying for you.
In Christ,
Julie