Joyce,
As I'm getting to the phone messages today, I see that you called our office. I apologize for not getting back to you sooner! We're fighting Influenza B here and are doing our best to keep up with orders/shipping/questions/ message board/phone calls/facebook/emails. My hubby is without a voice, making me the new phone person for a bit! So, I'm glad I've gotten a chance to help you here instead!
Thanks so much for coming back to share more about your daughter.

That really helps me see better where she fits skill-wise. If you are thinking about making this switch to HOD after completing their current Abeka programs, I would lean toward your older daughter doing Bigger Hearts and your just turning 5 year old doing Little Hearts. Your two kiddos, while not so far apart in age, are quite far apart in skills making it tough to combine them well. This is not unusual, as often first-born kiddos are just ready to go and more mature in their skills. It seems to be a God-given trait for first-born kiddos.
I can see why you'd want to consider grouping them together, especially since you have been doing two full levels of Abeka each day (which makes for a very full day indeed)! I think you may be pleasantly surprised by the switch to HOD, even with doing two different programs. Little Hearts just takes 90 min. each day, including phonics and math. Bigger takes about 2 and 1/2 hours a day with all parts included. If you keep your Abeka math, your day will be longer (because we allot 20 min. for math in Bigger with Singapore, so Abeka math will add a bit more time).
As far as Bigger Hearts goes, you would need the Economy Package, the Basic Package (with Singapore math 2A/2B), the Science Add-on, choice of Girl or Classic Set to read-aloud, and the Emerging Reader's Set with Beginner's Bible. Link:
http://www.heartofdakota.com/bigger-hearts-packages.php
The Emerging Reader's Set will be your child's reading. The Girl or Classic Set will be what you read aloud to her. If you choose to stay with Abeka for math, then you would not get the entire Basic Package, but you would instead purchase the following items from the Basic Package individually: Preparing to Build: English 2, Little Pillows, and Hymns for a Kid's Heart. Cursive is scheduled daily in Bigger, and I would lean toward choosing Cheerful Cursive. Your daughter would not need the Extension Package, probably would not need a phonics program, and would not need Drawn into the Heart of Reading at this stage of her learning. If you did feel that she had phonics left to learn yet, you could finish Abeka's phonics, either in place of/or while doing the Emerging Reader's Set of real books scheduled in the Appendix of Bigger Hearts.
For your 5 year old, you would need the Kindergarten Economy Package, the Kindergarten Basic Package (which includes the K math), A Reason for Writing 'K' for handwriting, either Reading Made Easy or The Reading Lesson for phonics (unless you plan to use Abeka's phonics), and choice of Bible (Family-Time Bible is the easier one for you to read aloud to your child as part of the history program).

Link:
http://www.heartofdakota.com/little-hearts-packages.php
That's it for your almost 5 year old.
I'll also link you to a couple of posts that may be of help to you!
What are we considering, when you ask us which guide your family should use?
viewtopic.php?f=6&t=9338
Why do we ask you to look at the placement chart for each of your individual children when considering the best placement for your family?
viewtopic.php?f=6&t=9339
Why don’t you recommend having children younger than the target age range of the HOD guide simply listen in with the older student’s guide?
viewtopic.php?f=6&t=9341
What would my child be missing out on if I did choose to combine him/her in a guide that doesn’t fit him/her well on the placement chart?
viewtopic.php?f=6&t=9342
How will we be learning as a family, if we do separate guides?
viewtopic.php?f=6&t=9343
Blessings,
Carrie