Iguana length

Question
I have a red female iguana named Dixie. I got her about 2 years ago. Right now she is about 3 years old. I'm worried that she isn't big enough for her age. She is 27-29 inches from head to tail. She has no broken tail or anything. I'm feeding her collard greens. I tried  mustard greens, green peppers, green beans, iguana Keble stuff, but she does not eat anything but mustard greens. I recently made a cage about 6 feet tall by 4 feet wide. Well anyways is she at a good length? Or is she to small? Is there anything I can do to make her grow better? And if she is to small for her age well she still reach full adult length?

Answer
Hi Axel,
First, I don't think the "reds" have been around long enough in captivity to really know how big they get or what "normal" size is for them as adults.
Second... I have a male ig(not red) that is small for his age.  he has always had the proper care and for years he was  very small.  He is now 7 yrs old and is long, but really has no bulk to him like many adult male iguanas.
When they have all the proper care, including proper uvb lighting, diet, temperatures and housing, and they have no health issues, then what ever size they are is what is their normal.  Genetics plays a big role in their size and with so many people breeding them, the gene pool takes a beating.
It really is hard to tell if she will get to be a 4 ft iguana but...you never know.  Just make sure she has all the proper care(see some of my old posts for more on care) and is healthy.  You may find that she is just a very slow grower or that she will always be on the smaller side.If you offer her dry iguana pellets(I use ReptiCal) be sure to soak them in warm water so they are soft 1/2 way through.  If they are fed dry, they will act like a sponge and suck the water our of your ig, causing dehydration.
On greens, etc.... Collards are very good and are the staple of a balanced diet. Other foods to try in addition to the collards you can try escarole, endive, arugula, different colored sweet peppers,yellow wax beans,grated butternut squash and other winter(hard) squash, snow peas, figs, papaya, mango and of course other fruits. On the squash, try steaming it til just barely soft...it makes it sweeter ad many igs prefer that over the raw. There are many more foods you can offer...so be sure to check out www.iguanaden.org  www.greenigsociety.org and www.anapsid.org   
Do continue to offer the foods she doesn't care for as you never know when they will decide to try them.
I hope this has helped you out a bit.  You may want to get a vet check up which includes bloodwork and a fecal to rule out any health issues.  If all comes back "normal" then like me, you have a smaller, slow growing adult iguana which isn't a bad thing at all. Also, is her cage 5-6 ft long or longer?  If yes, then you have a very nice size habitat for her. Do double check your temperatures and uvb lighting with my info in other posts, or if you prefer, just let me know and I can post my care sheet to you,