I think Asjha would be the best selection.
You look at the players listed at Forward for Team USA, and at the International level none of them are what you would call a 'bangers' or true power forwards by build: Swin, Catch, Seimone, Maya, Angel. Obviously Parker can play multiple positions but I would want Asjha at the 4 since now we only have Big Syl or Tina to play at the 5. Asjha is at least two inches taller and 20-30 lbs bigger than those other Forwards listed except for Parker, who is 6'4".
F Swin Cash...........6'1"...162
F Maya Moore..........6'0"...170
F Angel McCoughtry....6'1"...160
F Tamika Catchings....6'1"...167
F Candace Parker......6'4"...175
F Seimone Augustus....6'0"...168 (I doubt she is even that heavy)
F Asjha Jones.........6'3"...196
F Candice Dupree......6'2"...175
F Sophia Young........6'1"...165
I have to believe that many of the International teams are going to be very rough and physical with us, thinking that is their only shot. I don't think we need to go with another center to 'replace' Griner. I think we're OK with the 3 guards we have already because Seimone is really an off-guard and has a stellar handle. I think what we need is someone who can give us substantial minutes at the 4 spot and not get pushed around, someone whose best work is done in the trenches with no fanfare but who still gives us a lot of versatility and some real scoring ability. Parker will likely start at the 4, but there are going to be times when we really need another big body in there alongside our center. I don't think Appel is the right choice because she is more of a true 5 and I don't think we need a third center. We need a true Power Forward. Dupree and Young are outstanding players but again it's the combo of size/strength and overall skills that make Ashja the best choice *for this team*.
As Geno said, Asjha has been around the block a few times. She is a pro's pro and knows the little tricks. She's healthy. She's strong. She is the logical pick.