Needing to vent over partners sister

[freeman3030]

Hi all,
I really need to blow off some steam with regards to my partner's sister.
We haven't seen/heard from her since around April/May when she came to ask to borrow £17k. Prior to this she had borrowed £70 off of my partner and not paid him back, so naturally he said no due to the fact she hadn't paid back £70, which made him question whether she would repay £17k. Instead of accepting that we couldn't/wouldn't help her she shouted at him telling him that he had ruined her life and that she's nearly 30 and has nothing to show for it. My partner was naturally quite upset by it as it's not nice thing to hear but she just racks up debt after debt and in the past their dad has bailed her out, but at this point he must have refused so she turned to her brother.
Today, she text us both out of the blue asking what we would like for Xmas. I found this strange as we had both had birthdays since her outburst and she hadn't text a happy birthday or shown any sign salvaging a relationship, so wondering why Christmas is so important to get in touch.
I haven't replied because my immediate reaction would be to ask for the £70 owed and an apology for her behaviour earlier in the year. My partner said that it would cause an argument and doesn't want unecessary hassle. We had an exchange of words and I expressed to him that it bothers me that she treats him/their family in a way I find unacceptable and by not saying anything to her doesn't actually seem to work/help her in any way. But she's not MY sister, so it's not really for me to rock the boat so to speak.
I don't understand/agree with the way she treats people and have no interest in seeing her as she's always been a user, but for my partner's sake and the sake of his family it's expected for me to grin and bare it. She's so manipulative, if I was to confront her she would twist everything I said to make her look like the victim.
What would you do, I feel like ignoring her text makes me quite a petty person but I really don't know what how to respond without effecting my morals.
Any suggestions?

Might be to late to reply but I would ignore her message. If your DH chooses to accept her toxic behaviour that's his own choice, he could have a relationship with her without you.

Your husband sounds like a smart man. I would reply nicely.

Slight digression but why the fuck is anything that a certain type of person dislikes now "toxic"?

I would ignore the text too . In my experience , suddenly texting out of the blue means its leading up to something

I don't understand the figures

You loaned her £70.00 ?

And she then wanted to borrow £17,000.00?

Those are radically different figures - what on earth made her think you were going to give her seventeen thousand pounds?

Ditto, Laurie

I would let you dh respond.
If you do meet up smile and just be civil but don't offer any encouragement.

"I would let you dh respond."

Just text her back, "nice to hear from you I'd really like X for Christmas" life's too short. What do you actually gain from ignoring her or demanding apologies?

Yes I was thinking like Laurie, asking to borrow £70 is one thing but to huff because you won't lend her £17k is bizarre.

I would steer clear tbh.

Thanks for the responses. I think it's best for me to say nothing and leave it to my husband.
I do also feel BarberaRoyale is right and it could lead to something else. Whilst I understand and agree that life is too short, I'm not prepared for my partner to be taken for a fool either.
Unfortunately she has always been like this. She's always after money. The times we've gone out and she's "forgotten" her purse to pay for herself. Or her online banking has been down so she can't make the transfer.
There's been some very good advice. I think I shall remain civil but distant. I'm so glad I vented and thank you for reading/responding.
I'm answer to LaurieFairyCake, yes my partner lent her £70 which she didn't repay and then asked for 17k a short while later. My partner said to her that if she couldn't pay £70… how would she repay £17k and her response was "you deffinatly checked your online banking properly, I sent the money!" It's funny how she only said that when prompted about the cash she had borrowed. If I were to have borrowed money, I think I would have sent a messaging along the lines, "just to let you know I've transferred back £x. Thank you for the loan."
She's unreliable and I'm afraid I think she always will be.