Everything about the human body changes sometimes and sexual desire and response is no exception - it does tend to wax and wane over time.
Some women report being constantly horny for years on end...
Some women become very horny for a week every month...
For some it is a gift and for others it is a curse other women would envy...
One theory is it is mother nature driving you to breed...
Sexual desire and response is mostly governed by hormones: chemicals your body produces in varying quantities depending on lifestyle, diet, age and so forth. One of them. testosterone, is naturally present in women and can be increased by exercise and by having lots of sex...
Having lots of sex helps you want to have lots of sex...
My advice is enjoy the new feeling but as the change is sudden and you have done nothing to prompt it, if it persists for more than a few weeks, you should have a chat with your doctor in case the change has been caused by an underlying medical condition...
If it passes quickly then it was possibly your ticking body clock...