imo you can probably "afford" (in terms of mental energy) calling her once to thank her; you never know what might have happened.
assuming best case scenario here: some parents straight up don't know how to deal with something and are still trying to help, and your mother still seems to love and care about you if she still made you a gift after months of absence. there's still the possibility of her having gotten assistance and now knowing more of the subject, with regret associated with her actions.
maybe this gift was her apology. after all she's blocked so she didn't really have a variety of choices to get in touch with you, and yet she chose to make you a kind gift without bothering you. if i had to count all the people i know who would still attempt giving a little something after being blocked/dismissed for so long, it would be less than the fingers in one hand. what she did looked quite frankly amazing, and i feel a bit sad for her now.
obviously i don't know anything about your life, but in general "expecting apologies" is quite a poor concept because of how many of such situations are actually misunderstandings; the other party is not in your head and might not understand about the need to do such a thing.
and in the event she didn't change, well, one call to confirm that shouldn't hurt you too much, imo. you can just call in to get news from her, see how she's doing, what's she's been up to lately, and then talk about what happened that month and how bad you've been feeling after this. i don't mean this badly but "behave like an adult" and speak with her transparently, because she's not in your head and might not understand your needs. if the only time you actually told her that what she actually said hurt you was the day you blocked her from whatsapp, there's definitely been a natural miscommunication (due to feeling heated, happens to everyone).
i don't blame you here but i think there's wrongs on both sides, which is how 99% of situations work! don't feel bad about having made a potential mistake, that's the best way to learn (sadly).
best of luck for everything though, i hope for the best for both of you.
