Welcome to the forum...
Your female should get her adult/mature colors before she will be old enough to lay. She should develop mustardy yellow splotches and then bright blue dots.
Some veileds produce eggs and some don't depending to some extent on how you've been looking after them. In any case I would put a laybin in her cage and leave it there all the time. More on both of these things later.
If she does produce eggs, she will start to get fat in the body area and eventually start looking for a spot to lay the eggs. She will likely be thirsty more often and may stop eating as she nears the laying time. She may dig several test holes but should settle on one and dig it until she's happy with it. Then she should turn around butt down and lay the eggs ...likely in the evening. She may even sleep in the hole overnight.sometimes they lay fast and sometimes it takes quite a while. When she's done laying she should fill in the hole, tamp it down and return to the branches, hungry and thirsty. At this point you can dig up the eggs to see how many she laid...assuming they are infertile.
If it doesn't go this way then you should post on here so we can help you. If she becomes lethargic, sits low in the cage, sleeps during the day, etc. or phantom lays she needs help right away.
Laying bin...opaque container MINIMUM size 12" long by 8" deep by 8" wide...filled with washed playsand that is moist enough to hole a tunnel. I use a sand produced by kings that comes in a white bag with red, yellow, blue sandbox toys on the front.
Regarding whether they will lay eggs or not...controlling the temperature and the diet, etc can slow or even stop them from producing them. If you oversees them as they reach adulthood they will likely produce huge clutches which is hard on them. This can also lead to MBD and prolapsed etc. So as your female nears maturity she needs to be fed enough to sustain her without her being too thin but not giving her enough to push her into huge egg production. Making the temperature slightly lower in the basking area helps to keep them less hungry.
Hope this helps!