- How do I confirm validity of the link in terms of DeFi liquidity mining?
Check multiple sources that the referred link is valid. Ideally, you shouldn't trust the result of a search engine, especially, if it is an ad.
If you already found it, bookmark the site. Then only visit the platform/services you want to use from your bookmark list.
Is this a scam?
The link you referred to? absolutely.
Rephrasing from above, will I lose my cryptocurrency doing this?
Yes.
She also mentioned with another site prior (not the one below) that she had returns of 1% to 3% returns per day. This seems unrealistic/too good to be true. Is this possible?
You have answered it yourself. It's too good to be true.
Also, see this for scam reference about the site:
REDDIT: https://uniswap[]fashion Don't use this link for uniswap