I have told my DH. He was shocked at the extent of the 'loan'. I have apologized and he's agreed to let me sort it as long as there are no more loans. I'm upset that I have let him down but relieved to be turning a corner.
Well done! That took enormous courage - and I'm so glad that your DH is supporting you.
As others have said, though - you MUST stick to your guns now and NEVER "lend" her money again. I once heard that you should never end what you can't afford to lose, and I think it's good advice.
She has doubtless got a shock at you tasing for money from her. To be fair, as you have never refused her in the past, she may genuinely think that you and your DH have cash to spare.
She won't be hurt - she will be shocked and she may be angry, but for their own good they need to stand on their own feet. You wouldn't always be able to help them out even if you wanted to - your toddler will one day be off to uni, or ned a car etc, and you will need your full income.
from what you say, if she and her DP stopped the holidays and spending on their home (as you have had to), they could probably manage quite well. They don't need money to live - that want it to support a lifestyle
Different thing entirely.