Even if she just broke up with her ex of 2 years in December of 2019, she may have emotionally detached from that relationship months before that.
In other words, she may not need all that much recovery time and may be totally ready to date again.
The two of you have had some positive exchanges that may suggest that she is open to going out on a date with you. With that in mind, it would be best to ask her out and not wait longer.
You have already experienced firsthand what waiting too long to make your move on a girl can cause. It is never worth the risk of ultimately getting friendzoned or having some other guy come in and ask her out instead.