Angelica was actually using her comprehension of samsara laws to trigger her own reincarnation. She did not care what kind of reincarnation she would get. As long as she could reincarnate again, that was enough.
She would lose all of her current power, including her special physique and all of her talent. But as long as the reincarnation cycle of this universe remained intact and not under those invaders' rule, then she could come back again in the future.
Although she did not know what kind of life her reincarnation would experience, at least she would have a chance.
A chance to take revenge.
She might retain her memories, or maybe she would not retain them with how rushed she was right now in casting the reincarnation technique.
If she forgot about her current life, then in the future, if her reincarnation cultivated again, she would regain her memories. If the situation of the ninth heaven remained like this, then she could take revenge.
