So how long do you think it will be till i can get my saddle fitted?

If your saddle fits now, keep working her out by taking long walks & etc & she needs to stay trim & muscled. just like us. now she will do her normal groth but i wouldn't worry about refitting the saddle just yet. if i read this right, she is almost 4!? well, at 5 years she is considered a mare & her growing has pretty much halted. just concentrate on bonding & training. all will be fine with her saddle!