Well it's well known that Yukkuris and Money don't work well togheter anyway.
Why? Well they can't count beyond 3 or even being able to read. It tends to be troublesome, so a lot of problems may trigger from this, from them wanting more when they plainly can't afford it and get angry or bothersome because of it, or they'll be mugged by punks and stuff.
So it's well known that at the end Yukkuri + Money = Assured Failure. If you want to make them a favor, just don't give them money, give them food or drink, that would actually help them more.
Besides if this is the same old lady from that comic on which yukkuris attacked her, she may be little to willing to listen to yukkuris, which would be understable considering the bad past experience she had.