A few people have wondered about why others would have a 'no tv' rule, and why DVDs are seen as preferable.
From my POV, we have not TV, but do have DVDs which we play on the laptop.
Reasons - HATE that so much children's TV is really just advertising - even programs which I don't mind in and of themselves are actually long ads to promote al the merchandise that goes with them...not to mention actual ads for crappy food etc etc. Would love to see a ban on advertising to children as in some other countries.
DVDs have an end point, and depending on the length of the episodes they are easier for us to limit.
We get to choose what they watch - we only buy DVDs we are happy for them to have.
We also use this approach for our own discipline - stops DH and I watching too much tv, and also means we are less likely to be tempted to let DC watch too much.
As others have said, we fidn it easier to have a blanket ban on daytime TV, so that the DC pester less. Ours (3 and 5) are allowed to watch from 5-6pm (while I get dinner), and they alternate days as to who chooses dvd.
Having said that, DD did watch more when DS was smaller and more demanding, and when we have a newborn in a few months, we might allow more again, although TBH now that they are used to playing and do n ot expect TV/DVDs suring the days, we hope it wil n ot be a problem.
OP, I don't think its unreasonable to sugest TV to your fiends, but equally, she is not being unreasoanable to want to limit it - I think her hard work now will probably pay off long term, and if its an important principle for her, then she will feel worse if she voilates it (I was/am like this with BFing and cloth nappies - was hard, but good for me as it made me feel like I was suceeding as a parent IFSWIM)